With Zverev 20 years of age and de Minaur 19, the pair had the lowest combined age for an ATP level final since Rafael Nadal beat Novak Djokovic - then 20 and 19 respectively - in the Indian Wells final in 2007. Alexander Zverev completed a successful defence of his Citi Open title, beating final opponent Alex de Minaur in straight sets 6-2, 6-4. De Minaur may have lost the match, but a fine run in Washington will lift him up into the top 50 in the world rankings for the first time.