Spanish Royals at the 2000 Sydney Olympic Games
Many of the Spanish royals (and other royals) attended the Sydney Olympic games. Though they were there to cheer on the other Spaniards participating in the games, the royal family was cheering on one particular Spaniard: husband, son-in-law, brother-in-law Inaki Urdangarin, who was the team captain for the Spanish handball team. The support of the royals must've helped - Inaki and the team won the bronze medal.
Sources: IBL and Polfoto