Andre Agassi 1, ending Sampras's record of six consecutive year-ending top rankings (1993–98). This was the only time Agassi ended the year at No. 1. He began the next year by capturing his second Australian Open title, beating Sampras in a five-set semifinal and Yevgeny Kafelnikov in a four-set final. He was the first male player to have reached four consecutive Grand Slam finals since Rod Laver achieved the Grand Slam in 1969. At the time, Agassi was also only the fourth player since Laver to be the reigning champion of three of four Grand Slam events, missing only the Wimbledon title..
David Wheaton in 1991. He won the Grand Slam Cup in Munich, beating Michael Chang in straight sets in the final 7–5, 6–2, 6–4. He also reached the semi-finals of singles at Wimbledon (beating Petr Korda, Cédric Pioline, Ivan Lendl, Jan Gunnarsson and Andre Agassi in the quarter-finals before being knocked-out by Boris Becker), and was a men's doubles runner-up at the Australian Open (partnering with his former Stanford teammate Patrick McEnroe). Wheaton reached his career-high singles ranking of World No. 12 in July 1991. During his career, Wheaton won three top-level singles and three doubles titles, representing the US in Davis