There are some studies showing that paying close attention to hydration can help. Here is one for example:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5987390/
They looked at how much athletes sweated and gave half a recommended amount of hydration based on their sweat and left the other half as control. The non-control half did better in their sport activities. The research was not sponsored by any sports drink maker and did not use any particular sports drink. Of course only one study doesn't prove the correlation.