MILWAUKEE, WI (WHBL) - Prospect Jimmy Nelson will start in Marco Estrada's place on Saturday, when the Brewers host Saint Louis. The Brewers' called up Nelson Thursday from Triple-"A" Nashville, and sent Estrada to the bullpen after he gave up a Major League-high 27 homers so far this season. Skipper Ron Roenicke saw it as a way to improve the team, which has lost nine-of-its-last-10 and a six-game division lead over the second-place Cardinals has dwindled down to just two. Nelson has been nothing short of spectacular at Triple-"A" with a 10-2 record, a 1.46 E-R-A, and 114 strikeouts in 111 innings. He has not given up a run in his last 22 innings. And Nelson recorded his first Major League win in May in a spot-start at Miami. To make room for Nelson on the Milwaukee roster, the Brewers put reliever Wei-Chung Wang on the 15-day disabled list with what was termed as shoulder tightness. Wang has only pitched in blowout games, but as a Rule-Five draft pick, the Brewers must keep him at the big league level all season. Meanwhile, Milwaukee will now have three starters in Tuesday night's Major League All-Star Game. Jonathan Lucroy will be the starting National League catcher after Yadier Molina, of the Cardinals, went on the disabled list with a torn ligament in his right thumb. Molina will have surgery today, and will be out for 8 to 12 weeks. Fans elected Molina to start in the Mid-Summer Classic. Lucroy was second in the fan vote at catcher, and he topped the players' ballots, which put him in a position to replace Molina. The Brewers already had the most National League starters as fans elected third baseman Aramis Ramirez and outfielder Carlos Gomez.