ATP Tour 2013: How Will Rafael Nadal Play Following His Return to the ATP Tour? [VIDEO] Plus, Nadal Speaks Out About Drug Testing

Rafael Nadal lost both the singles and doubles finals in the VTR Open in Chile on Sunday, but made it back onto the court healthy for the first time in seven months in the process. Nadal offered his take on how the ATP should administer drug testing to its athletes as well.

Nadal beat two seeded players en route to the VTR singles championship, but lost 7-6,6-7, 4-6 to Horacio Zeballos. Nadal paired up with Juan Monaco in the doubles competition, but lost 6-2, 6-4 in the finals against Potito Starace and Paolo Lorenzi of Italy.

ESPN mentioned that Nadal's singles defeat was only his fifth in a final on a clay court, showing the dominance he has had on the surface in his playing career. Current top-ranked player Novak Djokovic and current number-two Roger Federer are the only other players to defeat Nadal in a championship round on clay.

Before the tournament in Vina del Mar, Nadal last competed in Wimbledon last June. He pulled out with a knee injury, and he reported passing six blood and urine tests during his recovery. The Spaniard said that who is being tested should be public knowledge, and everyone should also know how often the tests are being taken. Despite that opinion, Nadal also added that, "not everyone has to pay for some sinners.

Nadal believes there should be a balance between respecting athletes' privacy and testing frequently enough to catch those cheating. The current rules allow top tennis players to be tested at any time without warning, which is a much more stringent policy than many other sports (particularly American team sports).

ESPN debates what's in the immediate future for Rafael Nadal on the court in this video.

Knee injuries are especially challenging for any athlete to come back from, especially ones that require quickly changing directions and generating power from their lower body. It won't be an easy return to form for one of the best players in the world, but with more than half a year off, Nadal should have had plenty of time to recover. Now it's just a matter of gradually testing the knee and getting the rust off of his play.

You can see Rafael Nadal's bio and stats here.