Originally Posted by therecanbeonlyone
One advantage that is often overlooked is that the returner's mindset changes for second serves (maybe they relax a bit), and I am almost certain I have hit more second serve aces than 1sts lately.
Yup. I catch myself all the time doing that. I either over swing (over confident) or get lazy with the feet (under estimate) and make a pointless error. I catch myself making more errors on second serves than on firsts all the time especially when im playing for fun.