Spaniard claims his 67th career title with a 7-5 7-5 victory against dangerous Italian Fabio Fognini in final.
Top-seeded Rafael Nadal advances to semifinals of Hamburg Open by beating Pablo Cuevas 6-3 6-2.
World No 2 gives no reason for decision to pull out of Montreal event next month in statement from organisers.
Top seed overcomes sluggish start to beat his compatriot Fernando Verdasco in first round of German ATP event.
Australian completes a tumultuous fortnight to successfully defend title at Claro Open in Bogota.