On April 30, 1993, then-world No. 1 Monica Seles was playing Magdalena Maleeva in the Citizen Cup, an undistinguished event in Germany. Seles was up 4-3 in the second set after having won the first, and appeared to be within minutes of taking the match and moving onward.

And then, during the changeover, the entire world of tennis changed in an instant. Gunter Parche, an unemployed 38-year-old, leaned over and stabbed at Seles with a nine-inch blade. Parche later admitted an obsession with Steffi Graf, Seles' rival, and sought to end the rivalry himself.

"I remember sitting there, toweling

Seventeen-time Grand Slam champion Roger Federer is immensely talented, but not at delivering a piece to camera.

The world number two was simply asked to read a few lines off the autocue before signing the camera lens as an intro for TV show Trans World Sport, but it went a bit wrong.

Federer reeled off the script with consummate ease, but things swiftly unravelled for the Swiss star as he left the cap on his pen as he attempted in vain to sign his autograph on the lens.

It was a cute gaffe from the star, but thankfully there was a second take which he nailed before signing off. Well done,

The thing about the world's best tennis players these days is that they're operating at such a high level that it would surely be almost impossible for Joe Public to score so much as a point off them, wouldn't it?

Well, maybe not.

As this video - which has just come to light on these shores - shows, world number one Novak Djokovic was amongst the players at a charity event in Key Biscayne, Florida late last month, where a few members of the public were allowed to play a handful of points with the world's best.

Ray Collins was one lucky enough player, the amateur hitting up with Andy Murray on

Sara Errani might be ranked at number seven in the world, but who needs expensive coaches when you can practice off your parents' garage?

Here she demonstrates how she does it, blasting powerful groundstrokes against the back of the wall inside the garage with the door wide open.

Considering how much the LTA poor into Britain's best young talent, perhaps the governing body should adopt less expensive methods of training...

It is certainly working for Errani, who has seven career singles titles to her name and is also the world number two doubles player.

The Davis Cup trophy

New Zealand have been awarded their Davis Cup Asia/Oceania Group II tie against Pakistan after a hole about "an inch deep and half a foot wide" developed on the court in Myanmar.

The International Tennis Federation (ITF) said match referee Asitha Attygalla made the decision because of the unplayable surface on the grass courts in the neutral venue of Yangon, which was used because of security concerns in Pakistan.

"It has been a rough court from day one, concerns which we voiced," New Zealand captain Alistair Hunt told Radio Sport.

"The court only lasted about a match and a half before a

Great Britain take on Russian in a Euro/Africa Zone Group 1 Davis Cup on home soil in Coventry starting on Friday.

The quartet of James Ward, Dan Evans (who replaced Jamie Baker), Colin Fleming and Wimbledon doubles champion Jonny Marray are just one tie away from a World Group play-off but without Andy Murray they face an uphill battle against a Russian team featuring former Davis Cup champion Dmitry Tursunov.

Before the tie we interviewed the four British players involved plus team captain Leon Smith.

You can hear their thoughts on the fixture in the videos below.

Agnieszka Radwanska may already have played the best shot of 2013 after lightning-quick reflexes to bag a winner in Miami.

The Pole, seeded fourth, was playing Kirsten Flipkens and had already lost the first set.

It might have looked as if luck was evading her when Flipkens fired a shot which caught the tape of the net and bounced awkwardly.

No matter for Radwanska - she adjusted in an instant, performed a 360-degree turn and hit a blind drop shot that left her opponent flummoxed.

Radwanska, normally not one for an overstated celebration, clearly enjoyed the shot, and even Flipkens, who then

Tommy Haas, who turned 34 earlier this month, stunned the tennis world with a 6-2 6-4 victory over world number one Novak Djokovic at the Miami Masters with a truly inspired showing.

The 15th seed's victory was an upset, yes - by a big, big margin in tennis terms - but there was an incredible statistic behind the result that means it will be remembered for a long time to come.

The stat? No player Haas's age has beaten a world number one in 30 years.

It is rare that an upset occurs these days with the top four players in the world so utterly dominant.

The German veteran was ranked as high as