America's Brooks Koepka said it "kind of sucks" after he hit his best form in years on Friday just as the breakaway LIV Golf tour's first season is about to wind down.In hot and windy conditions at Saudi Arabia's Royal Greens course, the four-time major-winner shot eight-under-par 62 to lead South Africa's Charl Schwartzel by two after the first round.The Saudi-funded, 54-hole, no-cut invitational tour is making its debut on Saudi soil this week, ahead of the eighth and final event in Miami at the end of the month.