Australian Open semi-finalist David Ferrer came back down to earth with a bump on Tuesday after he was sent crashing out of the World Tennis Tournament in Rotterdam.

17208 - David Ferrer falls in Rotterdam

The world No. 6, who opened 2011 with a nine-match winning streak, claiming the title in Auckland before reaching the last-four in Melbourne, was ousted in straight sets by Finland's Jarkko Nieminen.

The Spaniard struggled with his serve, hitting five double faults and winning just 54% of service points against a player he beat in the Australian Open first round last month, as he suffered his first opening round defeat since August, falling 6-3 6-4 in 76 minutes.

Eighth seed Jo-Wilfried Tsonga came through a tricky first-round tie against Grigor Dimitrov unscathed. Tsonga, who is struggling to recapture his form after a knee injury, was upset by Aleksandr Dolgopolov in Melbourne, but had clearly learned his lesson as he moved past the talented Bulgarian teenager 6-4 6-4.

Ivan Ljubicic booked his place in the second round with a hard-fought 7-6(3) 6-3 win over Sergiy Stakhovsky, while Philipp Kohlschreiber beat Yen-Hsun Lu 6-4 7-6(5).