But it was back together Tuesday, as Ross started behind the plate against the Braves, the team he played for from 2009-12.
"Also David's swung the bat well against [Braves starter Aaron] Harang," said Red Sox manager John Farrell. "I think it's pretty fairly documented the history that Jon and David have had, it's been a successful one, not just this year but last year as well. We need that combination to be as effective again."
What makes Ross and Lester click so well together?
"We've created a good relationship coming off of last year and getting to know each other and what he likes to do and knowing his personality and when to talk to him and how to talk to him," Ross said. "I think I've created a lot of trust there. He trusts me. I've enjoyed caching him. He's one of the best lefties in the game. It makes my job really easy."
Lester had thrown to Ross in seven starts this season leading into Tuesday's game, posting a 2.39 ERA.
Ross was also looking forward to playing against his former team.
"A lot of good memories here," Ross said. "A lot of good buddies. I like a lot of the guys around here. Some of my best friends in baseball are from my years here."