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8/25/2013 1:11 P.M. ET

Tulowitzki sits with sore left side

MIAMI -- Rockies manager Walt Weiss said before Sunday's game against the Marlins that Troy Tulowitzki was being given the day off after experiencing soreness in his left side late in Saturday night's 3-0 loss to Miami.
"He's OK. He's a little sore," Weiss said of the Rockies' shortstop. "He felt something in his side last night. He talked me into letting him hit that last time up. I was planning on pinch-hitting for him there. He's a little sore today, so we're going to keep him down today. I wouldn't say it's an oblique, but it's in that area."
Weiss also said he does not think catcher Yorvit Torrealba will be activated when he's eligible to come off the 7-day concussion DL on Monday.
"I'm not sure if he's quite ready to be active yet," Weiss said. "I don't think it will be much longer, but I'm not expecting him to be active tomorrow."
Weiss also said that he anticipates that pitcher Tyler Chatwood will have his first rehab assignment this week at Colorado Springs.

Rosario impressing with progress, work ethic

MIAMI -- Rockies catcher Wilin Rosario had his 13-game hitting streak snapped on Friday and has yet to collect a hit in the first two games of the series against the Marlins.
There's been some speculation that Rosario might end up being groomed to play first base, which is where he played Wednesday night against the Phillies in Philadelphia. However, Rockies manager Walt Weiss thinks that it may be best to keep Rosario behind the plate.
"I see him as a catcher," Weiss said. "He's a young catcher and he's got some things to improve on, but the skill set is certainly there. He's a great athlete. With the things he can do offensively, for a catcher, he can be one of the elite players in the game."
Rosario, who was not in the starting lineup for the Rockies' final game Sunday against the Marlins, has certainly done his job at the plate this season. He entered Sunday with a .281 batting average and .485 slugging percentage with 20 homers and 70 RBIs. He's also made strides sitting behind the dish.
"I wasn't around last year, so I didn't get to see him up-close every day, but I saw enough of him," Weiss said. "He's come a long way. He was thrust into a tough position last year, skipping Triple-A, coming up here from Double-A with a very young staff. It was a tough assignment, but he's certainly made a lot of improvement this year."
Rex Brothers, who again has assumed the role of closer with Rafael Betancourt's recent trip to the disabled list, has nothing but praise for the way Rosario has progressed.
"His work ethic is second to none," Brothers said. "He takes a lot of pride in his game, which is why I think he's going to be playing for a long time. It's fun to watch a guy put that much work in and start reaping the benefits. It's good to see those results."
Reliever Matt Belisle has noticed, too, especially Rosario's defense.
"The offense was always there," Belisle said. "He's taken pride in improving his defense this year."

Worth noting

Michael Cuddyer seems to be enjoying playing day games more this year than in the past, at least based on his stats. Cuddyer is hitting .359 (46-for-128) with 12 doubles, nine homers and 27 RBI in 35 day games this season entering Sunday's game. Prior to this year, Cuddyer had not hit better than .290 during the day in any season.

Steve Dorsey is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.