He has been bemoaned as the bad boy of tennis but Nick Kyrgios demonstrated his generous side in pledging $50 for storm-hit Puerto Rico each time he blasts an ace. The 22-year-old Australian initially said he would give $10 for each ace towards emergency relief on the US island following Hurricane Maria, which hit two weeks ago leaving more than 30 people dead and thousands homeless. But in a tweet Kyrgios subsequently wrote: "You know what? I'm upping my offer... to $50 per ace. Let's help Puerto Rico."

Nick Kyrgios