Wimbledon 2015: Can anyone beat Serena Williams?

Serena Williams, the world number one, is overwhelming, crushing favourite to win Wimbledon. She's looking for her sixth title on the grass there - and if she wins, she's three-quarters of the way to a calendar slam (all she'll have to do then is win the US Open, and she's already done that six times).

Plus if she gets that calendar slam, it will also equal Steffi Graf's record of 22 slam titles in the Open era.

Wimbledon already seems a foregone conclusion.

Who's likely to challenge her? The wildly inconsistent Petra Kvitova is second seed; Simona Halep is seeded third but hasn't ever won a slam before; Maria Sharapova looked poorly at the French Open and was knocked out before the quarter-finals, but is still seeded fourth. Serena has nothing to worry about there.

So let's look further afield. Lucie Safarova looked like she had a chance of beating her in the French Open final for about half an hour; Ana Ivanovic didn't look good on grass in Birmingham a fortnight ago; and sister Venus Williams hasn't won a singles slam since 2008.

What's been most impressive about Serena in recent months is the way she's struggled through against feisty opponents plus illness and still powered a path through the draw.

Look at her form at Roland Garros - she dropped the first set in four of her matches (against Anna-Lena Friedsam, Victoria Azarenka, Sloane Stephens and Timea Bacsinszky) but came through to win in three. She mixed things up a little in the final against Lucie Safarova, losing the second-set breaker but sandwiching that between two easy set wins.

This isn't the best Serena Williams we've seen - yes, this is probably a Serena Williams in the swansong of her singles career. But this is a scrappy Serena who still has what it takes to win singles titles - and who wants to break all the records she can before she retires.