From BR Bullpen
- Bats Right, Throws Right
- Height 6' 8", Weight 210 lb.
Mike Bolsenbroek made his minor league debut in 2008.
Bolsenbroek was born in and grew up in the Netherlands. In the 2004 World Junior Championship, he allowed 2 runs (1 earned) in 6 2/3 IP and got the only Dutch win. In 2005, he made his Hoofdklasse debut, going 2-2 with a 2.86 ERA for HCAW, allowing only 14 hits in 22 innings. He was horrible in his lone playoff start, allowing 6 runs and 6 hits in 1 1/3 IP to take a loss. That year, Mike moved to the USA to further his baseball career, first at El Modena High School and then Santa Ana College. He was drafted in the 41st round of the 2006 amateur draft by the Chicago White Sox and in the 26th round of the 2007 amateur draft by the White Sox, but did not sign either time.
Bolsenbroek went to Germany to pitch in 2008, having finished his junior college days. He signed with the Buchbinder Legionäre in the southern division of Bundesliga-1. He was 4-0 with 2 saves and a 1.59 ERA for the club, giving up 26 hits in 56 2/3 IP and striking out 61 while walking 29. He finished third in the division in ERA behind Philipp Hoffschild and Eddie Aucoin. He had the third lowest WHIP after those same two hurlers and his .138 average allowed was the lowest.
Bolsenbroek was 0-1 with a 4.15 ERA in the 2008 European Cup in Regensburg, but with a RA over 9. He took the loss against DOOR Neptunus and was wild (5 walks, 2 wild pitches, 3 runs in 1 IP) in a start against Templiers de Sénart; Hoffschild came in to relieve and rescued the team, which won that outing. Overall, Mike walked 13 in 8 2/3 IP in the Cup.
Mike did not join the Legionäre for the Bundesliga playoffs as he was drafted in the 42nd round of the 2008 amateur draft by the Philadelphia Phillies. This time, he signed, a 7-year deal. He was the second Dutch player in Phillies organizational history, following Mike Crouwel (1992). Despite standing 6' 8", he was only the 4th-tallest Dutch hurler in Organized Baseball in 2008, following Loek van Mil, Rick van den Hurk and Swen Huijer.
Bolsenbroek pitched 5 games for the 2008 GCL Phillies, going 0-1. He allowed 3 runs (1 earned), 8 hits and 5 walks in 6 1/3 IP while fanning 5. In 2009, he was 2-2 with a 2.03 ERA and 30 K in 31 IP for the GCL Pllies. He moved up to the Williamsport Crosscutters in September and allowed one run in 4 2/3 IP.