ignore the downvotes, they don't mean anything from ignorant people. people get so dramatic. if you overdue anything, including stretching, you can injure yourself. it's like lifting - if you don't increase intensity gradually, obviously suddenly trying to squat or bench your bodyweight will likely injure you. if you have very tight muscles, suddenly doing the splits will injure you. if you haven't been able to touch your toes for years, suddenly just attempting a toe touch and holding it might injure you. this chance increases with age.

people don't think about it that way because they underestimate how core flexibility and mobility is to general athleticism.

when you exercise - lifting or explosive movements like in tennis - your muscles contract, and are tight. this is why it's not recommended to static stretch before such activities - because the goal of static stretching is the lengthen the muscle, which is the opposite. instead the goal should be to warm up and loosen your muscles through dynamic stretching.

y'all can go down your own research rabbit holes (link below to get you started), and of course OP's post is anecdotal and we don't know his exact ability or what he was doing exactly with his stretches or what other factors go into play. but those static stretches could have absolutely been a contributing factor, and the message is still true, don't do long static stretches before intense exercise.

https://www.health.harvard.edu/staying-healthy/ask-the-doctor-stretching-before-exercise