Twenty-times grand slam champion Roger Federer suffers a shock 3-6 6-3 7-6(4) defeat by Australian Thanasi Kokkinakis in the Miami Open second round on Saturday.

Roger Federer of Switzerland waves to the crowd while leaving the court after his match against Thanasi Kokkinakis of Australia on day five of the Miami Open at Tennis Center at Crandon Park on March 25, 2018.
Roger Federer of Switzerland waves to the crowd while leaving the court after his match against Thanasi Kokkinakis of Australia on day five of the Miami Open at Tennis Center at Crandon Park on March 25, 2018. (Reuters)

Roger Federer's latest reign atop the world rankings will end after the Swiss great's shock loss to Australian qualifier Thanasi Kokkinakis in the second round of the Miami Masters on Saturday.

Kokkinakis, ranked 175th in the world, needed a wild card just to get into qualifying.

But he showed nerves of steel in a 3-6, 6-3, 7-6 (7/4) triumph over 20-time Grand Slam champion Federer.

"I was calmer than I thought," Kokkinakis said of the third-set tiebreaker. "Inside I was pretty happy, I was excited, but I kept pretty calm."

Federer, who won his 20th Grand Slam crown at the Australian Open, regained the number one spot in February after winning the ATP title in Rotterdam but needed to reach the quarter-finals to remain at the summit. 

Instead he'll be replaced by Spain's Rafael Nadal when the rankings are released at the end of the tournament.

The 36-year-old wasted no time in announcing he'll skip the clay-court season, including the French Open, just as he did last year after winning titles in Indian Wells and Miami.

A good role model

The 21-year-old Kokkinakis, who has battled injury in his young career, became the lowest-ranked player to beat a world number one since Spain's Francisco Clavet was 178th when he upset top-ranked Lleyton Hewitt in the second round at Miami in 2003.

Federer appeared firmly in control when he breezed through the first set without facing a break point, dropping just six points on his own serve. His lone break for a 3-1 lead was all he needed to pocket the set.

But Kokkinakis seized upon a lackluster service game from Federer to break for a 3-1 lead in the second, holding firm on his own serve to force the decider.

"I didn't really put any pressure on him (in the first set)," Kokkinakis said.

"In the second set I kind of used a couple of loose errors - I started getting in the rallies more and dictating a bit with my forehand."

Federer was again impenetrable on his serve in the third, but he was unable to capitalise on his only two break points, both in a marathon sixth game, as they went on serve to the tiebreaker.

Two errors from Federer gave Kokkinakis a 4-3 lead. A stinging forehand winner put the young Aussie up 6-4, and he closed it out when Federer netted a backhand service return.

"When I feel like I'm playing on my terms I don't think there's too many people that can go with me Kokkinakis said. "I just needed to play my game and play aggressive tennis."

Same fate for women's top spot

Kokkinakis was delighted to beat a player he so admires, calling Federer "such a good role model for the sport."

He might have benefitted from a little inside information after practicing with Federer, who invited him to his training facility in Dubai.

"I've trained with him a lot of times," Kokkinakis said. "I took what I learned from him and sort of kind of knew how he played a little bit."

Meanwhile, women's world number one Simona Halep also tumbled out of the Miami Open on Saturday, falling 3-6, 6-2, 6-3 to Poland's Agnieszka Radwanska.

The third-round defeat comes a week after Romania's Halep was toppled in the semi-finals at Indian Wells by Japan's Naomi Osaka, who went on to win the title in the California desert.

Halep's exit leaves the women's field in the hardcourt tournament without its top two seeds, after second-seeded Australian Open champion Caroline Wozniacki lost to Monica Puig on Friday.

Despite the defeat, Halep is assured of retaining the number one spot when the rankings are updated at the end of the tournament.

Radwanska, the 2012 Miami champion, hadn't posted back-to-back match victories since January.

She'll face either 20th-seeded Anastasija Sevastova of Latvia or former world number one Victoria Azarenka of Belarus for a place in the quarter-finals.

Azarenka is unseeded this year as she vies to get her career on track after taking time off to have a baby.

Source: TRTWorld and agencies