April 27, 2003 (Sunday)
- Argentinians go to the polls to elect a president for the first time since the December 2001 economic collapse provoked street riots that unseated four presidents in two weeks. Carlos Menem beats fellow Peronist Néstor Kirchner in the first round of voting, but the closeness of the vote necessitates a runoff vote scheduled for May 18. Other candidates included former economy minister Ricardo López Murphy, former caretaker president Adolfo Rodríguez Saá, and lawmaker Elisa Carrio.
- A Soyuz spacecraft blasts off from Baikonur Cosmodrome towards the International Space Station, the first launch since the Columbia disaster.
- Pitcher Kevin Millwood of baseball team the Philadelphia Phillies, throws a no-hitter against the San Francisco Giants. The Phillies' Ricky Ledée hits a home run for the game's only run. It is only the ninth time in Phillies history a pitcher throws a no-hitter, and the first time for them since Tommy Greene did it in 1991.