I think some of TennisTroll's videos have been posted here before. I found this one pretty interesting. From the video's caption:
USTA 4.5 Tennis: Self-taught player in green shirt is 7-4 in singles competition in the USTA 4.5 / NTRP 4.5 league for 2019 and 1-0 in 2020 in Atlanta. He played USTA 4.5 league in both Atlanta and Virginia. He also reached the final of a 300 points NTRP 4.5 Championship tournament in Virginia by defeating the #1 and #3 seeds in the second and third rounds. Green shirt played in the 3.5 league in 2012, 4.0 in 2014, and 4.5 since 2015. He started playing tennis at 32 years old.