Exhibit 10.1

            AMENDMENT TO THE AMENDED AND RESTATED ALTERNATIVE INVESTMENT SELLING AGENT AGREEMENT

            This amendment (“Amendment”) dated as the 23rd day of June, 2020 to the Amended and Restated Alternative Investment Selling Agent Agreement (the “Agreement”)
              dated as of March 3, 2016, as amended from time to time, by and among each of the limited partnerships listed on Schedule 1 hereto (each, a “Partnership,” and together, the “Partnerships”), Ceres Managed Futures LLC, a Delaware limited
              liability company (the “General Partner”), and Morgan Stanley Smith Barney LLC, a Delaware limited liability company, currently doing business as Morgan Stanley Wealth Management (“MSSB” or “Placement Agent”). Capitalized terms used herein
              but not otherwise defined shall have the respective meanings assigned to them in the Agreement.

            W I T N E S S E T H:

            WHEREAS, the General Partner, the Partnerships and the Placement Agent agree to amend the Agreement to (i) reflect a reduction in
              the annual Ongoing Selling Agent Fee payable to the Placement Agent with respect to Class A Units of each Partnership (with the exception of Ceres Orion L.P. (“Orion”)) from 2.00% to 1.00% of the adjusted net assets of the Class A Units, (ii)
              reflect a change in the Ongoing Selling Agent Fee payable to the Placement Agent with respect to Class A Units of Orion from a transaction-based calculation to a flat annual fee of 1.00% of the adjusted net assets of Class A Units and (iii)
              update and replace Schedules 1 and 2; and

            WHEREAS, pursuant to Section 15(c) of the Agreement, any change to the Agreement must be in writing and signed by all parties.

            NOW, THEREFORE, the parties agree as follows:

            1.          Schedule 1 of the Agreement shall be deleted in its entirety and replaced by Schedule 1 attached hereto.

            2.          Schedule 2 of the Agreement shall be deleted in its entirety and replaced by Schedule 2 attached hereto.

            3.          The effective date of this Amendment shall be July 1, 2020.  Except as specifically provided for in this Amendment, the terms of the Agreement are hereby ratified and confirmed
              and remain in full force and effect.

            

            

            4.          This Amendment, together with the Agreement and any other documents referred to herein, constitutes the whole agreement between the parties relating to the subject matter of this
              Amendment and supersedes and extinguishes any prior drafts, agreements, undertakings, representations, warranties and arrangements of any nature, whether in writing or oral, relating to such subject matter.

            

            

            5.          This Amendment may be executed in any number of counterparts, including via facsimile or email, each of which is an original and all of which when taken together evidence the same
              agreement. Any signature on the signature page of this Amendment may be an original, a fax or an electronically transmitted signature or may be executed by applying an electronic signature using DocuSign or, if permitted by the General
              Partner (such permission not to be unreasonably withheld), any other similar program.

            

            

            
              
                


            

            6.          This Amendment shall be governed by and construed in accordance with the laws of the State of New York.

            

            

            
              
                


            

            IN WITNESS WHEREOF, this Amendment has been executed for and on behalf of the undersigned as of the date first written above.

            

            	 	
                    THE PARTNERSHIPS LISTED ON SCHEDULE 1 HERETO

                     

                  
	 	 	 
	 	 	 
	 	
                    By: Ceres Managed Futures LLC

                     

                  
	 	 
	 	
                    Name:

                  	
                    /s/ Patrick T. Egan

                  
	 	 	
                    Patrick T. Egan

                  
	 	
                    Title:

                  	
                    President

                  
	 	 	 
	 	 	 
	 	
                    Morgan Stanley Smith Barney LLC

                     

                  
	 	 
	 	
                    Name:

                  	
                    /s/ Carmen Lai

                  
	 	 	
                    Carmen Lai

                  
	 	
                    Title:

                  	
                    Executive Director

                  
	 	 	 
	 	 	 
	 	
                    Ceres Managed Futures LLC

                     

                  
	 	 
	 	
                    Name:

                  	
                    /s/ Patrick T. Egan

                  
	 	 	
                    Patrick T. Egan

                  
	 	
                    Title:

                  	
                    President

                  
	 	 	 


            

            

            
              
                


            

            

            

            Schedule 1

            	
                    PARTNERSHIP

                  	
                    STATE AND DATE OF ORGANIZATION

                  	
                    EFFECTIVE DATE

                  
	
                    Potomac Futures Fund L.P.

                  	
                    New York; March 14, 1997

                  	
                    October 1, 2013

                  
	
                    Ceres Abingdon L.P.

                    (formerly Managed Futures Premier Abingdon L.P.)

                  	
                    New York; November 8, 2005

                  	
                    October 1, 2013

                  
	
                    Emerging CTA Portfolio L.P.

                  	
                    New York; July 7, 2003

                  	
                    October 1, 2013

                  
	
                    Ceres Tactical Commodity L.P.

                    (formerly Managed Futures Premier Aventis II L.P.)

                  	
                    New York; April 20, 2005

                  	
                    October 1, 2013

                  
	
                    Ceres Tactical Systematic L.P. (formerly Tactical Diversified Futures Fund L.P.)

                  	
                    New York; December 3, 2002

                  	
                    October 1, 2013

                  
	
                    Ceres Orion L.P.

                    (formerly Orion Futures Fund L.P.)

                  	
                    New York; March 22, 1999

                  	
                    March 1, 2014

                  


            

            

          

          
            
              


          

          

            Schedule 2

            	
                    PARTNERSHIP

                     

                  	
                    ONGOING SELLING AGENT FEE

                     

                  
	
                    Potomac Futures Fund L.P.

                     

                  	
                    1.00% per year of the adjusted net assets of Class A Units (computed monthly by multiplying the adjusted net assets of the Class A Units by 1.00% and dividing the result thereof by 12).1  Class Z Units will not be subject to an ongoing selling agent fee.

                  
	
                    Ceres Abingdon L.P.

                    (formerly Managed Futures Premier Abingdon L.P.)

                  	
                    1.00% per year of the adjusted net assets of Class A Units and 0.75% per year of the adjusted net assets of Class D Units (computed monthly by multiplying the adjusted net assets of the Class A Units by
                      1.00% and the adjusted net assets of the Class D Units by 0.75% and dividing the result thereof by 12).1  Class Z Units will not be subject to an ongoing selling agent fee.

                  
	
                    Emerging CTA Portfolio L.P.

                     

                  	
                    1.00% per year of the adjusted net assets of Class A Units (computed monthly by multiplying the adjusted net assets of the Class A Units by 1.00% and dividing the result thereof by 12).1
                      Class Z Units will not be subject to an ongoing selling agent fee.

                  
	
                    Ceres Tactical Commodity L.P.

                    (formerly Managed Futures Premier Aventis II L.P.)

                  	
                    1.00% per year of the adjusted net assets of Class A Units and 0.75% per year of the adjusted net assets of Class D Units (computed monthly by multiplying the adjusted net assets of the Class A Units by
                      1.00% and the adjusted net assets of the Class D Units by 0.75% and dividing the result thereof by 12).1  Class Z Units will not be subject to an ongoing selling agent fee.

                  


            

            

            

              

              1           Adjusted net assets are month-end Net Assets increased by that current month’s ongoing selling agent fee,
                management fee, the general partner’s administrative fee, the incentive fee accrued, other expenses and any redemptions or distributions as of the end of such month.

            

            

            

            
              
                


            

            

            

            

            

            	
                    Ceres Tactical Systematic L.P.

                    (formerly Tactical Diversified Futures Fund L.P.)

                  	
                    1.00% per year of the adjusted net assets of Class A Units and 0.75% per year of the adjusted net assets of Class D Units (computed monthly by multiplying the adjusted net assets of the Class A Units by
                      1.00% and the adjusted net assets of the Class D Units by 0.75% and dividing the result thereof by 12).1  Class Z Units will not be subject to an ongoing selling agent fee.

                  
	
                    Ceres Orion L.P.

                    (formerly Orion Futures Fund L.P.)

                  	
                    1.00% per year of the adjusted net assets of Class A Units (computed monthly by multiplying the adjusted net assets of the Class A Units by 1.00% and dividing the result thereof by 12).1  Class

                      Z Units will not be subject to an ongoing selling agent fee.