Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Race Name | Circuit | City/Location | Date | Pole position | Fastest lap | Winning driver | Winning team | Report |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Dailkyo IndyCar Grand Prix | Surfers Paradise Street Circuit | Surfers Paradise , Australia | March 22 | Al Unser, Jr. | Emerson Fittipaldi | Emerson Fittipaldi | Marlboro Team Penske | Report |
| Valvoline 200 | Phoenix International Raceway | Phoenix, Arizona | April 5 | Michael Andretti | Rick Mears | Bobby Rahal | Rahal-Hogan Racing | Report |
| Toyota Grand Prix of Long Beach | Streets of Long Beach | Long Beach, California | April 12 | Michael Andretti | Unknown | Danny Sullivan | Galles-Kraco Racing | Report |
| 76th Indianapolis 500 | Indianapolis Motor Speedway | Speedway, Indiana | May 24 | Roberto Guerrero | Michael Andretti | Al Unser, Jr. | Galles-Kraco Racing | Report |
| ITT Automotive Grand Prix of Detroit | The Raceway on Belle Isle Park | Detroit, Michigan | June 7 | Michael Andretti | Unknown | Bobby Rahal | Rahal-Hogan Racing | Report |
| Budweiser/G.I.Joe´s 200 | Portland International Raceway | Portland, Oregon | June 21 | Emerson Fittipaldi | Unknown | Michael Andretti | Newman/Haas Racing | Report |
| Miller Genuine Draft 200 | Milwaukee Mile | West Allis, Wisconsin | June 28 | Bobby Rahal | Unknown | Michael Andretti | Newman/Haas Racing | Report |
| New England 200 | New Hampshire International Speedway | Loudon, New Hampshire | July 5 | Bobby Rahal | Michael Andretti | Bobby Rahal | Rahal-Hogan Racing | Report |
| Molson Indy Toronto | Exhibition Place | Toronto, Ontario | July 19 | Bobby Rahal | Unknown | Michael Andretti | Newman/Haas Racing | Report |
| Marlboro 500 | Michigan International Speedway | Brooklyn, Michigan | August 2 | Mario Andretti | Unknown | Scott Goodyear | Walker Motorsport | Report |
| Budweiser Grand Prix of Cleveland | Cleveland Burke Lakefront Airport | Cleveland, Ohio | August 9 | Emerson Fittipaldi | Unknown | Emerson Fittipaldi | Marlboro Team Penske | Report |
| Texaco/Havoline 200 | Road America | Elkhart Lake, Wisconsin | August 23 | Paul Tracy | Emerson Fittipaldi | Emerson Fittipaldi | Marlboro Team Penske | Report |
| Molson Indy Vancouver | Streets of Vancouver | Vancouver, British Columbia | August 30 | Michael Andretti | Emerson Fittipaldi | Michael Andretti | Newman/Haas Racing | Report |
| Pioneer Electronics 200 | Mid-Ohio Sports Car Course | Lexington, Ohio | September 13 | Michael Andretti | Unknown | Emerson Fittipaldi | Marlboro Team Penske | Report |
| Marlboro Challenge | Nazareth Speedway | Nazareth, Pennsylvania | October 3 | Michael Andretti | Unknown | Emerson Fittipaldi | Marlboro Team Penske | Report |
| Bosch Spark Plug Grand Prix | Nazareth Speedway | Nazareth, Pennsylvania | October 4 | Michael Andretti | Bobby Rahal | Bobby Rahal | Rahal-Hogan Racing | Report |
| Toyota Monterey Grand Prix | Mazda Raceway Laguna Seca | Monterey, California | October 18 | Michael Andretti | Unknown | Michael Andretti | Newman/Haas Racing | Report |
Question:
What team does mario andretti play pole position for?
Answer:
Walker Motorsport