Jon Lester yielded six runs -- five earned -- in six innings Monday against the White Sox to take his first loss of the season.

Lester, who entered 6-0, has always had problems with the White Sox. He's now 4-5 with a 5.43 ERA in 10 career starts against the team. He's 87-44 with a 3.64 ERA against everyone else.

Jon Lester allowed two runs over seven innings as the Red Sox defeated the Rays 9-2 on Wednesday.

The start came on the heels of Lester's one-hit gem against the Blue Jays his last time out. The southpaw wasn't quite up to that standard Wednesday, but he was still plenty good enough to get the win. He's now 6-0 with a 2.72 ERA and is enjoying a bounce-back campaign from his down 2012. His next start will come Monday against the White Sox.

Jon Lester tossed a one-hit shutout Friday in a 5-0 win over the Blue Jays.

It was his third career shutout and his 10th complete game. Lester faced one batter over the minimum, striking out five while walking none. The Blue Jays' only hit was a two-out double by Maicer Izturis in the sixth inning. Lester is now 5-0 on the year and holds an excellent 2.73 ERA and 45/15 K/BB ratio over 52 2/3 innings. He'll look to keep his bounce-back campaign rolling next week against the Rays.

Jon Lester allowed six runs -- five earned -- in six innings in the Red Sox loss to the Blue Jays on Tuesday.

Lester has been a revelation in the early going, but Tuesday was a bump in the road. Even with the loss, Lester still owns a 3.11 ERA and 1.14 WHIP through six starts. He looks to be back to the pitcher we remember from pre-2012. He'll try to be better Sunday against the Rangers.

Jon Lester moved to 4-0 despite walking six and allowing three runs in 5 2/3 innings Wednesday against the A's.

Lester was really shaky today after a stellar first four starts, but only Chris Young made him pay and the offense was good enough to get him his fourth win. Young's three-run homer was the first allowed by Lester this season. The six walks tied his career high.

Jon Lester was excellent yet again Thursday, holding the Indians to two runs over seven innings in a 6-3 victory.

Lester limited the Indians to just four hits and one walk. Both runs scored on ground outs. He fanned five batters in the victory and is now 3-0 with a 1.73 ERA and 23/4 K/BB ratio over his first four starts this season. The southpaw will look to keep his bounce-back campaign rolling next week when he faces the Athletics.

Jon Lester's early-season resurgence continued Saturday, as he fired seven innings of one-run ball in a no-decision against the Rays.

Lester gave up just five hits and one walk and retired 14 out of the final 15 batters he faced. He struck out five. While a win would have been nice, the southpaw owns a 1.42 ERA through his first three starts and appears well on his way to rewarding those who were banking on a bounce-back campaign. He'll get the Indians next Thursday.

Jon Lester spun seven shutout innings in Sunday's 13-0 blowout victory over the Blue Jays.

He gave up just five hits, didn't walk anyone and struck out six. Lester was terrific during spring training, and it's carried over with a 1.50 ERA, 1.50 WHIP and 13/2 K/BB ratio over his first two outings. He'll try to keep it going next weekend against the Rays.

Jon Lester limited the Yankees to two earned runs over five innings in Monday's season-opening win.

Lester struck out seven. The right-hander was excellent throughout spring training and is a definite bounceback candidate after posting an underwhelming 4.82 ERA and 1.38 WHIP across 205 1/3 innings in 2012. He will face off against a tough Blue Jays lineup next.

Jon Lester will start on Opening Day against the Yankees on April 1.