Nick Tepesch had no issues with the blister on his right middle finger during a bullpen session on Thursday, and is scheduled to start Sunday at Seattle.With Tepesch cleared for Sunday’s start, Yu Darvish will start Game 1 of Monday’s doubleheader in Phoenix against Arizona. The Rangers have not announced the other starter for Monday, but it could be right-hander Ross Wolf, who won his first game Wednesday. Other options include Josh Lindblom and Martin Perez.Colby Lewis, meanwhile, also threw a bullpen session Thursday and it went well. Lewis, recovering from flexor tendon surgery and a brief bout with triceps tendinitis, is confirmed to make another medical rehabilitation start for Triple A Round Rock on Saturday in Memphis.Lowe released, Teahen signedThe Rangers placed veteran right-hander Derek Lowe on unconditional release waivers, which means the team will have to pay his full $1.25 million salary.Lowe was designated for assignment on Monday to clear a spot for Josh Lindblom. The 39-year-old Lowe made nine relief appearances and had a 9.00 ERA.The Rangers also announced they signed infielder/outfielder Mark Teahen to a minor-league contract. Teahen, 31, will work out at the Rangers’ complex in Surprise, Ariz., on Thursday and report to Triple A Round Rock in Memphis on Friday.Teahen is best known for his time with the Kansas City Royals from 2005-09, and also played with the Chicago White Sox (2010-11) and Toronto Blue Jays (2011).He started this season in the Diamondbacks organization.