According to The Sun this is the reason why Kim Sears left Andy Murray: he played videogames for seven hours a day and even on the Wii he didn't manage to win a second set.
If you can meet with triumph and disaster
And treat those two imposters just the same;
If you can make one heap of all your winnings
And risk it on one turn of pitch-and-toss,
And lose, and start again at your beginnings
And never breathe a word about your loss;
Yours is the Earth and everything that's in it,
And—which is more—you'll be a Man my son!
—Rudyard Kipling