Roughing up Rivera

Mariano Rivera gave up his second homer of the season on Wednesday, a three-run shot to Curtis Granderson. Rivera then recorded the final out in a rare 1/3 inning of work to finish the Yankees 8-6 victory over Detroit. Rivera has allowed two homers this April. The 39-year-old's previous high for home runs in a season as Yankees closer is four. His ERA spiked to 3.12.

Fantasy Impact: We love Mariano Rivera and expect him to be fine from here on out. We also realize that Rivera's age must begin to be a concern at some point, and advise owners in keeper leagues to be aware of his recent struggles. If the home run numbers come up, that could be an indication that time is catching up to the sure-fire Hall of Famer.

Bullpen blues for Piniella

Kevin Gregg walked three straight batters in the eighth against Arizona, including walking in a run. His ERA climbs to 6.23. Don't panic, Gregg owners, because Carlos Marmol's ERA jumped to 6.75 as he walked in two Diamondbacks earlier in the game. Gregg is the Cubs closer, Marmol is the setup man and Jeff Samardzija might be the dark horse to leap both for the closer role. Samardzija struck out two of the three Diamondbacks he faced, although he did give up a 2-RBI double to Justin Upton. Both of the runs were charged to Marmol as the Cubs lose 10-0.

Fantasy Impact: We're not speculating that Samardzija will earn the closer job imminently, but we're thinking Lou Piniella might need to get creative if he wants to solidify his 'pen. Samardzija is an intriguing talent - a hard-throwing stud with movement and a steady demeanor. If Marmol and Gregg continue to implode, Piniella's hand may eventually be forced. Keep an eye on the situation, especially if Samardzija begins to take off in his setup role.

Closer dilemma in Denver

Manny Corpas had the day off anyway, but Huston Street might make it a two-horse back of the bullpen again with his second save of the season. Street struck out three straight Padres en route to a 7-5 Rockies win. Corpas is still the closer, but it's not long before Clint Hurdle re-evaluates the position for a second time this season.

Fantasy Impact: As has been the case in recent seasons, the Rockies bullpen remains a work in progress. Neither Street nor Corpas appears to be a great source for saves in 2009 as each takes away from the other and then gives back what he's taken. Corpas is the better bet while he's in the role, but that can change on the whim of Hurdle.