Lin (quadriceps) has allowed three earned runs on four hits and four walks while striking out eight batters over 10.1 innings in two starts for Double-A Midland since being reinstated from the 7-day injured list May 20.
The 20-year-old lefty missed about two weeks of action due to a left quad strain. One of the Athletics' top pitching prospects, Lin could soon be ready for a promotion to Triple-A Las Vegas after turning in a 2.03 ERA, 0.88 WHIP and 51:13 K:BB in 44.1 innings through his first nine starts with Midland.