Walking tall

Compared to the men in the Wimbledon crowds, Diego Schwartzman is below average height at 5ft 7ins but he is not spectacularly short. Judged against other tennis players, there can be no doubt that the Argentine is on the small side - he is the shortest player to have broken into the elite since the 1980s, and the New York Times has called him "a tennis David in a sport of Goliaths".

The world No.11, who plays 6ft British wild card Liam Broady for a place in the last 32, once wrote an essay for the ATP's website on how being short didn't define him:

"When I walk on to a tennis court, I don’t think about how tall I am or how much bigger my opponent is. I know there is a difference, but so what? Maybe if I was 10 or 15 centimetres taller, I’d have a better serve or be able to hit with more power. But my height isn’t going to change. I’m not going to wake up the size of John Isner or Ivo Karlovic."

Feeling so lucky

Lady Luck appears to be a Kristie Ahn fan. While the American was beaten in the final round of Qualifying, she still made it into the main draw as a 'lucky loser' because of a withdrawal, and then in her opening appearance she survived a match point against Britain's Heather Watson.

Ahn now plays countrywoman Sloane Stephens, who beat a former Wimbledon champion, Czech Petra Kvitova, in the opening round.

Keeping busy

In between match wins at the All England Club, Vera Zvonareva got married, started a family and did a Master's degree, and also had the time to retire and un-retire.

Until Tuesday, the Muscovite, who was the runner-up to Serena Williams in 2010, hadn't won a match on these lawns since 2014.

Zvonareva plays Poland's Iga Swiatek, the 2020 Roland-Garros champion, for a spot in round three. By reaching the second round, Swiatek is already having the best Wimbledon of her career.

Marching on

Danielle Collins is playing only her second tournament since having an operation to remove a cyst - said to have been the size of a tennis ball - from her ovary.

The first was Roland-Garros, where she made the third round before losing to fellow American Serena Williams. Collins plays Switzerland's Viktorija Golubic in the second round.

Repeating the feat

One of the hardest matches to play is the one immediately after beating one of the top seeds. That's particularly true for a young player.

And that's the challenge facing Frances Tiafoe, a 23-year-old American who defeated Greece's Stefanos Tsitsipas in the first round, and now meets Canada's Vasek Pospisil.