World number one Novak Djokovic slumped to a 6-4, 7-6 (8/6) defeat by Dusan Lajovic in the Banja Luka quarter-finals on Friday, raising further concerns over his form ahead of next month's French Open.

World No 1 Novak Djokovic stunned by Dusan Lajovic in Banja Luka quarters

Flamboyant Italian Fabio Fognini followed up his shock victory over Rafael Nadal with a 6-3, 6-4 final win over Serbian Dusan Lajovic to claim his maiden Masters title in Monte Carlo on Sunday.

Fabio Fognini lands maiden Masters title in Monte Carlo

Having annoyed Rafa Nadal with an underarm serve at Acapulco, Nick Kyrgios doubled down with the tactic to win two points against hapless Serb Dusan Lajovic at the Miami Open and fire up a timeworn debate between modern fans and purists.

Underarm or underhanded? Nick Kyrgios serve stokes debate

Bulgaria's Grigor Dimitrov crashed out of the China Open on Wednesday after losing to Serbia's Dusan Lajovic 6-4, 2-6, 6-4, in the roun of 16 on Wednesday. The third-seed shock exit came in one hour and 53 minutes at the hands of an opponent who is yet to win a career title.

Grigor Dimitrov stunned by Lajovic, crashes out of China Open

Grigor Dimitrov, Alexander Zverev, Kei Nishikori have entered the third round at French Open on Wednesday

Dimitrov, Zverev, Nishikori reach round 3rd at Roland-Garros

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World No 1 Novak Djokovic stunned by Dusan Lajovic in Banja Luka quarters

Fabio Fognini lands maiden Masters title in Monte Carlo

Underarm or underhanded? Nick Kyrgios serve stokes debate

Grigor Dimitrov stunned by Lajovic, crashes out of China Open

Dimitrov, Zverev, Nishikori reach round 3rd at Roland-Garros