I think Sascha is a serious contender for the AO, behind Novak obviously, but right there with Daniil and Rafa.
Also, 4 big titles this year and 8 for his career. That ties him with Arthur Ashe, Guillermo Vilas and Michael Chang.
Players by Total Big Titles
62 Novak Djokovic
57 Rafael Nadal
54 Roger Federer
33 Ivan Lendl
32 John McEnroe, Pete Sampras
31 Jimmy Connors
27 Andre Agassi
25 Rod Laver, Bjorn Borg
23 Boris Becker
20 Andy Murray
15 Mats Wilander
14 Stefan Edberg
13 Ken Rosewall
12 John Newcombe, Ilie Nastase
9 Jim Courier, Thomas Muster, Gustavo Kuerten
8 Arthur Ashe, Guillermo Vilas, Michael Chang, ALEX ZVEREV
Players with 4+ big titles in a season, by number of seasons:
10 Novak Djokovic
9 Rafael Nadal
7 Roger Federer
5 Ivan Lendl
4 Jimmy Connors, John McEnroe
3 Rod Laver, Bjorn Borg, Pete Sampras
2 Ken Rosewall
1 Ilie Nastase, Mats Wilander, Stefan Edberg, Boris Becker, Andre Agassi, Thomas Muster, Marcelo Rios, Andy Murray, ALEX ZVEREV
By most big titles in a season:
10 Djokovic (2015)
9 McEnroe (1984)
8 Federer (2006), Djokovic (2011)
7 Lendl (1986), Federer (2004), Nadal (2013)
6 Laver (1969, 70), Sampras (1994, 97), Federer (2005, 07), Nadal (2008, 10), Djokovic (2014, 16), Murray (2016)
5 Nastase (1973), Connors (1976), Borg (1979, 80), Lendl (1982, 85, 89), McEnroe (1983), Wilander (1988), Federer (2017), Nadal (2005), Djokovic (2012, 13)
4 Rosewall (1968, 72), Laver (1968), Connors (1974, 78, 83), Borg (1978), McEnroe (1978, 81), Lendl (1987), Becker (1988), Edberg (1990), Agassi (1995), Sampras (1995), Muster (1995), Rios (1998), Federer (2009, 12), Nadal (2007, 09,17, 18, 19), Djokovic (2008, 18, 19, 21), ZVEREV (2021)