"For me, I still need a little more arm strength, but I am close to where I need to be," Cashner said. "It's a matter of building up arm strength and getting to the 100-pitch mark and the 115-pitch mark, recovering and building up again."
Cashner's season-high for one start is 98 pitches. He finished with 89 against the Phillies.
"For me, the big thing is I'm free and getting on top of my pitches," Cashner said. "My sinker is running more. Throwing the sinker more, I'm able to find the feel and the lanes, and that comes with the [number] of throws moving forward."
Rangers stay pat with pitching
The Rangers are off on Monday and Banister said there are no plans to use the off-day to adjust their rotation. The plan is to give all five starters an extra day of rest.
The off-day and the work of reliever Austin Bibens-Dirkx kept the Rangers from making a roster move on Sunday. Bibens-Dirkx threw 4 2/3 scoreless innings in relief of A.J. Griffin on Saturday, which kept the Rangers from taxing the rest of the bullpen. Bibens-Dirkx is unavailable for a couple of days, but the rest of the bullpen has had at least one day off.
Bibens-Dirkx's outing was the sixth longest by a Major League reliever this season. Only one of the other five were scoreless. It was the longest scoreless relief outing by a Rangers pitcher since Nick Martinez threw five scoreless against Oakland on April 28, 2014. The last Rangers reliever to throw 4 2/3 scoreless innings and allow just one hit was Pat Mahomes back in '01.
• The Red Sox rotation for the three-game series against the Rangers calls for right-hander Rick Porcello on Tuesday, left-hander Chris Sale on Wednesday and left-hander Drew Pomeranz on Thursday.
• Griffin allowed three consecutive home runs in the first inning of the Rangers' 9-3 loss on Saturday. Prior to that, he was one of three pitchers in the Major Leagues with five or more starts who hadn't allowed a run in the first inning.
• The Rangers have had a different winning pitcher in each of their last 11 wins. The two pitchers on the staff who have been left out are Bibens-Dirkx and Alex Claudio.
T.R. Sullivan has covered the Rangers since 1989, and for MLB.com since 2006. Follow him on Twitter @Sullivan_Ranger and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.