No team has beaten the Red Sox in a series since May 22, but the Orioles have a chance to do just that Sunday.
After the Orioles won the first two games of the series, Boston answered back with a 5-4 victory Saturday to give it a chance to salvage a series split.
The Red Sox have won their last four series and haven't lost their last seven sets, but recent history is on Baltimore's side. The Orioles haven't dropped consecutive games to Boston in the squads' last 33 meetings.
Orioles starter Miguel Gonzalez will try to extend the mark to 34. He's scheduled to start for Baltimore, but there's a possibility he'll have more important things to take care of.
Gonzalez's wife is pregnant and is scheduled to give birth on Wednesday. Obviously, that could change quickly.
"I cross my fingers for them and the health of the baby and the mother," Orioles manager Buck Showalter said. "If he's got to go, he goes. If we [don't have] contingent plans in place, then shame on us. So whole scheme of life, down the road, [the birth of your child] is a lot more important. He'll be there -- unless it happens real rapidly and he can't get to L.A."
As of now, Gonzalez (4-2, 3.71 ERA) has no plans to miss the start.
"I have to keep working out, keep doing what I'm doing in between starts, what I need to do, and I'll focus on my family after," he said.
Jon Lester will take the mound for the Red Sox, but he has had his share of struggles as of late. The southpaw had his worst start of the season against Tampa Bay on Tuesday, when he gave up seven runs in just 4 2/3 innings. After starting the year 6-0 with a 2.72 ERA, Lester has just one quality start in his last five outings, posting a 6.90 ERA in that span.
The struggles prompted some to question Lester's health, but the veteran insists he's just not executing at a high level.
"I feel great," he said after his last start. "I honestly do. I know pitch count's been a thing this year, but tonight I felt great. Probably the best I've felt all season. It just comes down to commanding the baseball, whether you have nagging stuff, minor stuff, whatever it is -- commanding the baseball is simple, and I didn't do that."
Red Sox: Buchholz scratched from Tuesday start
Clay Buchholz won't be pitching either game of Tuesday's doubleheader against Tampa Bay and could be headed to the disabled list.
"Clay threw today and feels a little bit better than he did yesterday," Red Sox manager John Farrell said, "but not to the point where he's going to throw a bullpen [session] tomorrow. We do have the benefit of the off-day [Monday] where we can keep guys on turn with Felix [Doubront] going on Tuesday, [Ryan] Dempster on Wednesday and stay on turn from there. Right now, we haven't announced the other starter for Tuesday."
Buchholz is suffering from neck soreness after making an awkward play at first base during his June 8 start against Angels.
The right-hander is 9-0 on the year with a 1.71 ERA.
Orioles: Roberts to rejoin team
Brian Roberts will join the Orioles on their road trip to Detroit and Toronto next week, a sign he's getting closer to a rehab assignment.
Roberts, who is on the 60-day disabled list with a right hamstring injury, took batting practice on the field this week.
"Brian's going to go with us to Detroit, probably Toronto, and hopefully after that road trip we'll be talking about going out [on a rehab assignment]," Showalter said. "We'll see. We'll see how that goes."
Roberts said he still has some work to do before getting back on the field at any level.
"No, I can't go play yet," Roberts said. "I still have some progressions to go through, especially running. I haven't gotten to the point where I'm doing real explosive running, so we still have a little bit of time."
• Manny Machado extended his hit streak to 13 games Saturday with a 2-for-4 performance. He leads with Major Leagues with 31 doubles and 97 hits.
• Dustin Pedroia, who has started all 70 games for Boston this year, made his first error of the season Saturday on a ground ball in the fifth inning.
• The Orioles are the only team in the AL East that the Red Sox have a losing record against. Boston is 2-4 against Baltimore and 16-8 against all other division opponents.
Michael Periatt is an associate reporter for MLB.com. Follow him on Twitter @Michael Periatt. This story was not subject to the approval of Major League Baseball or its clubs.