A gold medal is likely as valuable to a top tennis player as any title not among the 4 Grand Slams. The Masters Cup or a Masters Series event with deep history such as Rome might be deemed more valuable than gold by various top players. Depending on the nation and mindset of a player Gold may or may not be as valuable as winning the Davis Cup. I got the sense that Carlos Moya was extremely happy to win TMS Rome and the Davis Cup in 2004. Those are accomplishments a player can share with family, friends and fans. So too is an Olympic Gold medal.