Answer
All Grand Slams eluded Marcelo Ríos, the former Chilean tennis star widely regarded as one of the most talented players of the 1990s. Despite achieving a career-high ranking of World No. 1 in 1998 and reaching the quarterfinals of all four Grand Slam tournaments, Ríos never managed to capture a Grand Slam title, coming closest with a runner-up finish at the 1998 Australian Open.