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With her name freshly engraved onto the Australian Open trophy, Serena Williams feels she can play on indefinitely and is intent on increasing her tally of 19 Grand Slams. The American great, 33, scoffed at talk of retirement after shooting down Maria Sharapova in straight sets to win her sixth title at Melbourne Park, becoming the oldest woman to ever lift the trophy. Williams has endured her share of injury scares during a long career, including a life-threatening pulmonary embolism in 2011 that sidelined her for 12 months. "I can play as long as I like now," Williams said after moving to clear second on the list of all-time Open-era Slam winners behind Steffi Graf on 22.