"If he's hitting .300 with runners in scoring position, you're looking at 80 RBIs instead of 62, or whatever he has," manager Dale Sveum said. "That's' the stat that has to be better."
Rizzo, who turns 24 on Thursday, is playing in his first full Major League season, but he posted good numbers in 87 games after being called up in June last year. That included those key RBI situations, as Rizzo hit .338 with a .961 OPS with runners in scoring position in 2012.
"He was hitting the ball the other way a lot. He did a lot of good things with runners in scoring position," Sveum said. "This year, it's like he's trying to hit a home run every time somebody is in scoring position."
Rizzo also has a team-leading 18 homers, and four of his last six hits have been home runs. Rizzo, whose OPS in his last six games is 1.099 because of all the homers, was out of the starting lineup on Wednesday against Phillies left-hander Cole Hamels.
Stephen Pianovich is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.