Juan Martin del Potro upset

[truebluefan]

Ernests Gulbis of Latvia

Ernests Gulbis of Latvia has upset top-seeded Juan Martin del Potro 6-3, 6-4 to book a place in the semifinals of the ABN Amro tournament.

Del Potro, who is also the tournament's defending champion, saved four break points in the first set. The Argentine is recovering from a wrist injury and it is not clear whether it may have been bothering him.

Read more http://espn.go.com/tennis/story/_/id/10455811/quarterfinals-abn-amro-tournament