I grew up playing tennis and did not play squash until later in life. I had pretty much given up tennis though for the last few years as I really enjoyed squash more. I have played a tennis though a couple of times in the last few weeks and have really enjoyed it.
I have been playing squash now continuously for several years without any real break. After one slightly frustrating game of squash I decided to go outside and pickup a tennis racquet. It was a very nice change of pace. My expectation was low and just went out to relax and have fun - and I did. Playing a game just to enjoy myself was a nice change of pace. I always play squash fairly seriously but when I went out to play tennis I was just hitting shots and not worrying about the outcome of a match. After a bit when I started to find my shots again I was hitting really well. I found that the more relaxed I was when hitting my shots the better the outcome.