Happ, 32, has consistently had an ERA over 4.00 during his career. The lefty has pitched 108 2/3 innings this season, positing an ERA of 4.64 and a WHIP of 1.41 and a strikeout rate of 6.8 per nine innings.
The 23-year-old Sampson has pitched in Triple-A all year, posting in ERA of 3.98 in 124 1/3 innings. The right-hander also has a strikeout rate of 6.9 per nine innings and give up 0.6 home runs per nine innings.
Pirates have acquired LHP J.A. Happ from Seattle in exchange for minor league pitcher Adrian Sampson. pic.twitter.com/nDcHYKdz0I
— Pittsburgh Pirates (@Pirates) July 31, 2015
#Mariners acquire RHP Adrian Sampson from the Pirates for LHP J.A. Happ. Sampson is local product from Skyline HS/Bellevue College.
— MarinersPR (@MarinersPR) July 31, 2015