Aaron Cook left Tuesday's start after four innings with neck spasms.

He allowed four runs on five hits -- including a Ryan Howard home run -- and a walk before exiting. It's not clear at this point whether it could affect his availability for his next start, which, for the time being, is scheduled to come over the weekend against the Nationals. Edgmer Escalona replaced Cook on the mound.

Aaron Cook spun seven shutout innings in a 3-1 win over the Dodgers on Wednesday.

Cook struck out just two, walked a pair and gave up six hits. He finally picked up his first win in his last start and followed it by tossing his best game of the year. Cook is 2-5 with a 5.05 ERA and 1.72 WHIP. His rotation spot is hanging by a thread, but these past few outings should buy him some time.

Aaron Cook finally picked up his first win after allowing four runs in six-plus innings Friday against the Diamondbacks.

A two-run rally in the top of the seventh gave the Rockies a 5-4 lead and put Cook in position to claim the win. Cook also helped his own cause before that, going 2-for-3 with an RBI. At 1-5 with a 5.84 ERA, his rotation spot is hanging by a thread, but this won't hurt.

Aaron Cook fell to 0-5 after allowing three runs over 4 2/3 innings Sunday against the Brewers.

Cook struck out just one, walked three and gave up eight hits. He was forced to throw 90 pitches despite not making it out of the fifth inning and his ERA now stands at 5.82. Stay away.

Aaron Cook got lit up by the Braves on Wednesday evening, allowing seven runs on 10 hits and one walk in five innings of a 9-1 Rockies loss.

The ugly outing drops Cook to 0-4 through his first six starts while ballooning his ERA to 5.82 and WHIP to 1.76. Through 34 innings of work, he is the owner of a pathetic 13/14 K/BB ratio. He's not worth owning in NL-only leagues.

Aaron Cook surrendered one run and five hits in six innings Thursday in a no-decision versus the White Sox.

The bullpen blew a three-run lead, so Cook remains winless in five starts since coming off the DL. Still, this was a solid effort that should provide him with a little more job security. His ERA stands at 4.66.

Aaron Cook was tagged for six runs (five earned) over 5 2/3 innings in Saturday's loss to the Yankees.

Cook gave up a season-high 12 hits -- including four doubles -- while walking one and striking out one. The veteran sinker-baller now has a 5.48 ERA and 11/9 K/BB ratio over four starts since coming off the disabled list on June 8. He's not a fantasy option right now.

The Rockies are expected to target a starting pitcher before the trade deadline, so Aaron Cook and Juan Nicasio could be fighting over their next few starts to stay in the rotation.

Cook has struggled his his trademark sinker, posting a 4.67 ERA and 1.56 WHIP in three starts, while Nicasio has lost the feel for his changeup and was knocked around his last time out. It's not clear who the Rockies might target via trade, but Troy Renck of the Denver Post mentions the Astros' Wandy Rodriguez and Brett Myers, the Cubs' Carlos Zambrano and the Marlins' Anibal Sanchez as possibilities.

Aaron Cook struggled against the Tigers on Sunday, allowing four runs on eight hits in six innings of a 9-1 Rockies loss at home.

He struck out four and walked two in falling to 0-2. Through three starts and 17 1/3 innings, Cook is now the owner of a 4.67 ERA and 1.56 WHIP. His fourth start should come on Saturday against the Yankees, an outing you'd likely be wise to keep him benched for.

Aaron Cook allowed two runs on five hits and two walks in 5 2/3 innings on Monday evening, taking the loss in Colorado's 3-1 setback against the Padres.

Cook would have gone deeper in the game, but was pulled after a one hour and 23 minute rain delay. The owner of a 3.97 ERA and 1.50 WHIP through his first 11 1/3 innings of work this season, Cook isn't likely to be more than a spot-starting option for mixed-league players.

Aaron Cook allowed three runs on six hits and four walks in 5 2/3 innings of work on Wednesday, but took home a no-decision in Colorado's 5-3 win over the Padres in San Diego.

He struck out four in his 2011 debut. Coming off a rocky 2010 season, Cook is not worth a look outside of very deep NL-only leagues. His next start should come on Monday, where he will again face the Padres, this time in Colorado.

Aaron Cook (finger) will make his season debut Wednesday against the Padres.

Cook has been sidelined since fracturing the ring finger on his throwing hand during spring training. "It'll be a Major League game, so there'll probably be a little more energy," said Cook. "I guess fortunately and unfortunately, I've come off the DL in the middle of the season before, so I know what to expect. I've been through it. I'm looking to not do too much, just be myself." Factoring in his past success at PETCO Park (7-1, 2.21 ERA over 11 starts) and the awful Padres' lineup, he could be worth rolling the dice in deeper formats.

Aaron Cook (finger) will make another minor league rehab start Thursday with Triple-A Colorado Springs.

The Rockies expected to activate him from the disabled list this week, but Juan Nicasio's strong start against the Cardinals on Saturday has caused them to reconsider. Cook gave up six runs over 7 2/3 innings during his last rehab start, so he could probably use the extra work, anyway. If all goes well, Cook will return next Thursday against the Padres.

Aaron Cook (finger) allowed six runs on eight hits over 7 2/3 innings Saturday in his final rehab start for Triple-A Colorado Springs.

Despite the less than ideal results, the Rockies are pleased with how Cook threw the ball. "He threw some quality pitches down in the zone," Sky Sox manager Stu Cole said of Cook. "He looked pretty sharp. He's getting back to the form he had before. He got groundball outs after groundball outs." Cook will rejoin the Rockies rotation this week.

Aaron Cook (finger, shoulder) allowed four runs in five innings Monday in a rehab start at Double-A Tulsa.

Cook racked up six strikeouts and did not walk a batter, but he surrendered seven hits in the unimpressive rehab outing. The Rockies will likely ask the righty to make one more minor league start before returning to the big league rotation in early June.

The Rockies were encouraged by Aaron Cook's (finger, shoulder) rehab outing Wednesday with Double-A Tulsa.

Cook gave up one run on three hits and a walk while striking out six over five innings. "He had a really, really good sinker," manager Jim Tracy said. "We're really, really encouraged to hear that, believe me." Cook will have a couple more rehab starts before rejoining the Rockies rotation in early June.

Aaron Cook (finger, shoulder) had a successful bullpen session Thursday and will make a rehab start for Double-A Tulsa Saturday.

He's expected to throw four innings in the outing. If all goes well, Cook's final rehab start will come on May 28 or 29, meaning he'll have an additional four outings after Saturday. He's slated to rejoin the Rockies in early June.

Aaron Cook (finger, shoulder) threw 30 pitches Wednesday in a two-inning simulated game.

Cook is scheduled to begin a minor league rehab assignment after his next simulated outing. The right-hander is aiming to return to the Rockies in late May.

If all goes well for Aaron Cook (finger, shoulder) in two mini simulated games, he'll then go on rehab assignment.

He'll be starting on the assignment to build up his innings, likely replacing Esmil Rogers in the rotation when he's ready. He should be good to go by the end of the month.

Aaron Cook (finger, shoulder) threw 15 pitches to live hitters on Friday.

Cook will join the club on Wednesday to throw a simulated game. He has received positive feedback on recent sessions however he is still a long ways away from returning. He is not even eligible to come off the disabled listed until early June.