The 22-time Grand Slam champion's physical limitations were laid bare in what could be his last appearance as a professional player.

Rafael Nadal, one of the greatest men's tennis players in history, closed out his legendary career playing for Spain in the Davis Cup.

Rafael Nadal bit his lower lip and his reddened eyes welled with tears as he stood alongside his Davis Cup teammates for Spain's national anthem Tuesday before what he — and everyone — knew might be the last match of his career.