Pitcher Ryan Dempster takes the mound for the Boston Red Sox's home contest against the Colorado Rockies Tuesday night at 7:10 p.m. ET.

Watch online Colorado Rockies vs. Boston Red Sox live stream, click here.

Via ESPN:

Dempster (4-8, 4.23 ERA) has lost three of five outings despite a 3.48 ERA, and he's recorded quality starts in each of his last four games in Boston. The most recent was a 6-2 loss against Tampa Bay on Wednesday as he gave up three runs over six innings.

"I just wish we were winning more of the games that I'm starting," Dempster said after Boston fell to 6-9 in his starts.

He's surrendered three or fewer earned runs in five of his eight losses, with the Red Sox providing him two runs or fewer in seven of those games. His run-support average of 5.44 is inflated by a 17-5 win over Texas on June 4. Excluding that game, his average would dip to 2.64.

The major-league low is 2.69 for Chris Sale of the Chicago White Sox.

"Seemingly, there's a guy on each staff that might be pitching on the wrong day, and that's probably the case with Ryan on a few occasions," manager John Farrell said. "That's something completely out of his control, but yet at the same time, we're in position to win almost every time he walks to the mound."

Dempster is 5-4 with a 7.83 ERA in 11 starts against Colorado.