Yuichi Sugita scored one of the upsets of the Australian Open's first round on Monday, beating eighth seed Jack Sock of the United States in four sets.
The 41st-ranked Sugita took 2 hours, 33 minutes to complete the 6-1, 7-6 (7-4), 5-7, 6-3 victory over world No. 9 Sock, who appeared to be hampered by the hip injury he suffered in the previous meeting between the two players on Jan. 2 at the Hopman Cup.
The 25-year-old American retired from that encounter after hurting his hip in a fall, and was clearly not back to full health for Monday's match.