Wimbledon, which starts on Monday, has banned all Russian and Belarusian players from this year's tournament
Ukrainian tennis player Sergiy Stakhovski is famous for defeating Roger Federer in 2013 and is now a volunteer fighter on a military patrol in Kyiv.
Triple Grand Slam titleholder Novak Djokovic had to fight hard before reaching the quarter-finals of the Dubai Open on Wednesday and moving to within one win of a possible rematch with Andy Murray.