Tucsonan Matt Grevers, an Olympic swimming medalist in 2008 and 2012, is favored in Saturday’s “Fastest Swimmer in Texas” swimming competition in San Antonio. The fastest to swim 50 meters in a three-heat event will earn $5,000. The women’s competition includes ex-Arizona All-American Lara Jackson, an American record holder who has come out of retirement to train for the 2016 Olympics.