(August 8, 2021) Nineteen-year old Italian Jannik Sinner became the first teenager to win an ATP 500 event when he defeated Mackenzie McDonald of the U. S. 7-5, 4-6, 7-5 to win the Citi Open title in Washington D.C. on Sunday evening. The nearly three-hour battle was a contest of wills. Sinner needed 11 set points to claim the first set. In the third set Sinner had 5-2 lead … [Read more...] about Jannik Sinner holds off a late charging Mackenzie McDonald to win Citi Open in Washington, D.C.