"Today is a planned down day for him. It gives Mike Napoli a chance to DH and get off his feet on this turf," Farrell said.
Ortiz, who began the season on the disabled list with a sore right Achilles, has been on a tear since returning. The 37-year-old is batting .487 with three homers, 15 RBIs and a 1.490 OPS in just 10 games.
Farrell is quite familiar with Ortiz from his time as pitching coach Boston from 2007-10 and said age hasn't slowed the slugger down.
"No, he's better," Farrell said when asked if Ortiz is the same player now as he was back then. "Everyone probably associates extra-base and home-run power with David, but he has gotten better as a hitter, smarter as a hitter. He'll look to drive the ball early in counts, and then with two strikes, he'll look to take what opposing pitchers are giving to him -- and he uses the whole field.
"He has a rare blend of that high average and power capability."
Jarrod Saltalamacchia said teammates look up to Ortiz and admire how strong he is mentally. It's his easy-going attitude, Saltalamacchia believes, that is part of the reason Ortiz has played at such an elite level for so long.
"There is no hitter I can think of that is mentally stronger than him," Saltalamacchia said. "You may get him one time, but he's going to get you the next at-bat. That's tough to do in this game, especially when that's all you do. This is all he does, is hit. There are no other designated hitters in the game like him.
"He'll have a conversation with a guy, laughing and joking and then he'll be like, 'Oh, I have to hit now,' and he'll go out and hit a homer. He's a special breed."
Chris Toman is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.