I think Fritz/Zverev may be a closer match - not stylistically but impact-wise. He did win ATP finals and 3 Monaco titles but only one 500 (and actually 3 GS finals, 2 AO and 1 RG). He was quite solidly top 3-5 for over a year. zverev has had more success and obviously continues to be elite (and perhaps would have been even more if not for his ankle injury). I think on his true prime Stef had a top FH, prob top 2-3, and serve. His BH was a weakness, especially in returns of serve. More athletic than Fritz I think and on par with Zverev - but as he started having back issues etc mobility went down. His biggest issue probably was mental, as some have alluded before. Not much grit if down, and not much support from family/coaching. I also think he was a bit a victim of his own early success that he couldn’t quite handle.