PERTH, Australia (AFP) — Serena Williams completed a clean sweep of her singles matches at the mixed teams Hopman Cup in Perth Thursday as she prepares for her bid to make Grand Slam history at the Australian Open. The winner of 23 Slam singles titles, Williams was made to work a little harder than expected by young Brit Katie Boulter in the United States’ final group tie, but prevailed in straight sets to make it […]