I doubt they do anything. Right now the hot trade ticket is Happ but Joe is going to play him.
I'm thinking that they target:
(From MLBTR)
1. Yu Darvish. Nine starts into his season, Darvish is not quite in vintage form. His 2.76 ERA ranks 11th in the American League, though strikeouts are down and walks are up. The key stat might be his 58 2/3 innings pitched, good for a second-place tie in the league. Darvish’s second career 200-inning campaign would quiet concerns after his 22-month Tommy John layoff, possibly leading to the largest contract of the winter. In the short term, the question is whether Darvish will be traded this summer. The Rangers have climbed into the Wild Card discussion with an eight-game winning streak, though they’re already eight games behind the Astros for the division lead.
9. Michael Pineda. Tanaka’s rotation-mate has a home run problem as well, with a full quarter of Pineda’s fly-balls going for home runs. Nonetheless, he’s posted a ridiculous strikeout-to-walk ratio accompanied by a solid 3.42 ERA through eight starts. Despite the 10 home runs allowed, Pineda has been able to avoid disaster starts. Has the 28-year-old actually “figured it out” and harnessed his considerable stuff? Jake Devin of Pinstripe Alley asked that question earlier this week, and found the results to be inconclusive.
Tanaka is too risky.
With that they would need a back of the rotation lefty. That would be a trade target.
6) Max Fried, LHP, Grade B+: Age 22, 3.93 ERA with 112/47 K/BB in 103 innings in Low-A, 87 hits, nice recovery season from Tommy John surgery and was especially effective late in the season; fastball at 91-95, change-up still needs some work but curveball and slider have developed well; struck out 52 in last 39 innings in the regular season. Another guy who could be an above-average to excellent pitcher for a long time. ETA: 2019.