Yes Marcelo Rios would change his career with Gaston Gaudio. If Dominic Thiem didn’t win a slam before retiring he would have been forever disappointed despite all his other success. He has said it himself. Being a slam champion is the pinnacle of the sport.Top players with a gazillion masters wont change a slam for 5 masters, but players that dont win many titles dont be so sure. 5 masters mean more money than winning 1 slam, and if you win several Masters in a row (like Ríos in 1998) it could mean world number 1. And getting to world number #1 with 0 slams is way better than winning 1 slam in your career but not getting to world #1.
Do you think Marcelo Ríos would like to change careers with Gaston Gaudio? I dont think so.