Great to see Nadal back in action, of course. I did not realize, though, that he would be taking on both the doubles and singles draws at Montreal. This caught be my surprise, especially since he's just coming back from a victory. On one end, this is a good move to get back into the rhythm of playing tournaments again. He has a match he can expend to get back into his groove, test the waters, etc. However, on the flip side, he is recovering from an injury, and more court time will only hinder him. That brings to light the issue of Nadal potentially excelling in doubles in the future to preserve his tennis career as a whole. Of course, doubles would be much lighter on the body as we see in players like Daniel Nestor and Bjorkman, who both had careers (and in the case of Nestor, has a career) well into their 30s. For Nadal, doubles tennis might be the most reasonable way to keep his name alive in the argument of tennis greats by having a longer career with potential doubles Grand Slam titles. That said, tackling both doubles and singles in major events like Masters events could be heavily taxing on his body and shorten his career prospects in both fields. Sure, doubles is light on the body; but if his singles play is already taking such a toll on him, adding doubles will only make matters worse, especially in situations where he plays two matches a day. Moreover, this would only get worse if he were to go deep in both draws. Thus, while Nadal has pretty decent prospects as a doubles player and already great prospects as a singles player, his career longevity could be influenced by how much he plays both. Perhaps playing more doubles and less singles could be a good move to extend his career. However, I would much rather see him in singles action and have him focus exclusively on singles during Masters events and (as he already does) during Grand Slams.