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The Hewitt-Federer rivalry refers to the intense on-court competition between Australian tennis player Lleyton Hewitt and Swiss tennis maestro Roger Federer. Their rivalry is considered one of the most memorable and fierce in tennis history, spanning from the late 1990s to the mid-2000s. The rivalry was marked by contrasting playing styles, with Hewitt's aggressive baseline game clashing against Federer's elegant serve-and-volley approach.