Rosenthal On Rodriguez, Tejada, Brewers

MLB executives tell Ken Rosenthal of FOX Sports that the struggles of large market teams such as the Mets and Dodgers have helped build competitive balance in baseball this year. Here are Rosenthal’s notes from around the league:

• Though Francisco Rodriguez has 15 saves (16 chances) and a sparkling 0.76 ERA, his fastball velocity (90.4 mph) continues to drop and two scouts say his stuff is diminished. That perception could affect the right-hander’s trade value this summer.
• D’Backs GM Kevin Towers told Rosenthal that righty Josh Collmenter’s arm angle almost makes him look left-handed and helps create deception.
• While Miguel Tejada has struggled this year, he’s heating up at the plate and the Giants aren’t about to quit on him, according to Rosenthal.
• The Brewers are pleasantly surprised by Yuniesky Betancourt’s defensive work this season. If you haven’t seen these plays, you’re in for a pleasant surprise yourself.
• Rosenthal confirms that the Mariners figure to call top prospect Dustin Ackley up before long.