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:
| Rnd | Date | Race Name | Length | Track | Location | Pole Position | Winning Driver |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | March 14 | Jimmy Bryan 150 | mi (km) | Phoenix International Raceway | Avondale , Arizona | Al Unser | Bobby Unser |
| 2.0 | May 2 | Trenton 200 | mi (km) | Trenton International Speedway | Trenton , New Jersey | A. J. Foyt | Johnny Rutherford |
| 3.0 | May 30 | International 500 Mile Sweepstakes | mi (km) | Indianapolis Motor Speedway | Speedway , Indiana | Johnny Rutherford | Johnny Rutherford |
| 4.0 | June 13 | Rex Mays Classic | mi (km) | Wisconsin State Fair Park Speedway | West Allis , Wisconsin | Gordon Johncock | Mike Mosley |
| 5.0 | June 27 | Schaefer 500 | mi (km) | Pocono International Raceway | Long Pond , Pennsylvania | Johnny Parsons | Al Unser |
| 6.0 | July 18 | Norton Twin 200s | mi (km) | Michigan International Speedway | Brooklyn , Michigan | A. J. Foyt | Gordon Johncock |
| 7.0 | August 1 | Texas 150 | mi (km) | Texas World Speedway | College Station , Texas | A. J. Foyt | A. J. Foyt |
| 8.0 | August 15 | Trenton 200 | mi (km) | Trenton International Speedway | Trenton , New Jersey | A. J. Foyt | Gordon Johncock |
| 9.0 | August 22 | Tony Bettenhausen 200 | mi (km) | Wisconsin State Fair Park Speedway | West Allis , Wisconsin | Johnny Rutherford | Al Unser |
| 10.0 | September 5 | California 500 | mi (km) | Ontario Motor Speedway | Ontario , California | A. J. Foyt | Bobby Unser |
| 11.0 | September 18 | Michigan 150 | mi (km) | Michigan International Speedway | Brooklyn , Michigan | A. J. Foyt | A. J. Foyt |
| 12.0 | October 31 | Benihana World Series of Auto Racing | mi (km) | Texas World Speedway | College Station , Texas | A. J. Foyt | Johnny Rutherford |
Question:
In what round did Al Unser win at Wisconsin State Fair Park Speedway? 
Answer:
9.0