Phoenix, AZ (WHBL-Learfield) - Marco Estrada has improved his chances of becoming the Milwaukee Brewers’ fifth starter for April. He gave up three hits in four-and-a-third innings yesterday, as the Brewers blanked San Diego 7-to-nothing in an exhibition game in Phoenix. Estrada is one of several pitchers auditioning for the temporary Number-five job, which opened up after Zack Greinke cracked a rib in February. Manager Ron Roenicke said Estrada’s audition was the best he’s seen so far. Ryan Braun doubled and singled in the Brewers’ victory, and George Kottaras had three hits. Prince Fielder missed the game with a sinus infection. Milwaukee improved its Cactus League record to 14-9-and-1. They’ll have their only off-day of the spring today. Meanwhile, Brewers’ backup infielder Mat Gamel was sent down to Triple-“A” Nashville yesterday. He spent much of the spring with a strained rib-cage muscle, and he committed two throwing errors at third in the last week. He’ll report to the team’s minor league camp to learn how to play first. Gamel could be a candidate for the job if Fielder leaves.