Serena Williams back doing what she does best at Wimbledon

Simona Halep at Wimbledon in 2017

So far, she's allegedly been drug tested 5 times in 2018.

"So not at all", Williams told a press conference at Wimbledon on Sunday.

Having struggled to establish a rhythm against her Swedish opponent during the opening set, the ninth-seeded Williams won 10 games in a row from 1-2 in the second to take control. She's not opposed to drug testing, but said: "Just test everyone equally".

Defending champion Roger Federer marked the start of his 20th successive Wimbledon with a new look and a comfortable 6-1, 6-3, 6-4 win over Serbia's Dusan Lajovic on Monday.

"I think probably it would be helpful a few more years for the boys to really remember". An athlete will receive a "missed test" rating for unavailability during the window.

"It is standard practice on many testing missions to obtain both urine and blood samples, resulting in multiple samples from a single testing mission", Horn said.

A spokeswoman for Williams, apparently not down with the whole anti-doping thing, released a statement saying "there is absolutely no reason for this kind of invasive and targeted treatment". Even if they do test me at my current ranking of 454 in the world.

"You know, I'm here to do the best that I can do".

In this battle between two powerful players, we could undoubtedly witness strings of service holds though Williams will be looking to make the breakthrough by emphasizing her aggression on second serve returns. She got upset by a line judge's mistaken call that led to the replay of a point she should have won but instead lost.

"I actually thought the article was interesting, to be honest, because I never knew that I was tested so much more than everyone else", said Williams, who is in search of a record-tying 24th Grand Slam singles title. "I was just like: "That's just weird".

"But I'm very excited to see her attempt an unbelievable comeback". In Dubai, I've hardly ever been tested, which is quite disappointing. That was the last time she won a match at the All England Club. I thought, you know, 'Hey, I have this wonderful child, I have all these grand slams, this is all super bonus, ' and it is.

The easy explanation for that could be that cycling and athletics are higher-risk sports for doping so warrant more testing, but that theory crumbles when you consider the physical demands on modern tennis players, then weigh up the risk-reward ratio for those considering a move to the dark side. I think I've had seven tests.

"I really don't like being away from her". Other past major titlists in action include U.S. Open champion Sloane Stephens, Australian Open champion Caroline Wozniacki and 2014 U.S. Open champion and 2017 Wimbledon runner-up Marin Cilic.

"Maybe that's the part I don't like so much, the inconsistency of the places where they test". What's important is these people are professional, they know what they're doing, they treat you like humans, not like criminals.

"It was a bit in the back of my mind that I would have a chance but I didn't put too much on it".

"I understand the frustrations at times".