The Oakland Athletics are calling up 24-year old lefty starting pitcher Sean Manaea to start Friday against the Houston Astros. Manaea came into this season as the A’s #2 prospect according to Baseball America. He has pitched in 3 games (all starts) in AAA-ball for the A’s so far this year and he is 2-0 with a 1.50 ERA and a 1.11 WHIP. Manaea has given up 16 hits and 4 walks while whiffing 21 batters in his first 18 innings in the minors so far this year. Manaea has now pitched in 42 games (all starts) for the A’s in his first three years in the minors and he is 16-9 with a 2.82 ERA and a 1.26 WHIP.