Top seed Nadal upset by unseeded McDonald in Australian Open (updated)

MELBOURNE, Jan. 18 (Xinhua) -- Defending champion and top seed Rafael Nadal crashed out of the Australian Open on Wednesday after going down 6-4, 6-4, 7-5 to unseeded Mackenzie McDonald of the United States in the second round.

Nadal lost his first two service games, with world No. 65 McDonald taking a 4-1 lead before claiming the set 6-4.

When the 27-year-old McDonald charged into a 5-3 lead in the secon