Would be interesting to compare the performance of nalbandian and tsonga vs zverev at slams
Actual performance level produce is something I'll have to leave to someone else but we can at least take a superficial look at their deep slam runs:
Tsonga - 1 final lost to Novak at the AO in 08, 5 further semis, 9 further quarters.
SF losses were to Fed (10 AO), Novak (11 W), Murray (12 W), Ferrer (13 FO) and Stan (15 FO).
QF losses were to Verdasco (09 AO), Murray (10 W), Fed (11 USO), Novak (12 FO), Fed (13 AO), Murray (16 W), Novak (16 USO and, Stan (17 AO).
Nalbandian - 1 final lost to Hewitt at Wimbledon in 02, 4 further semis, 5 further quarters.
SF losses were to Roddick (03 USO), Gaston Gaudio (04 FO), Baghdatis (06 AO) and Fed (06 FO).
QF losses were to Rainer Schuttler (03 AO), Fed (04 AO), Hewitt (05 AO), Thomas Johansson (05 W) and Fed (05 USO).
Tsonga had rougher competition to deal with. Nalbandian had more injury problems that curtailed his career.
Both of them got a couple of Masters, Nalbandian picked up a WTF title too. You'd expect Nalbandian to have a better tail on his career without the injuries but I don't think a slam win was particularly on the cards given the era that had come along (that 07 Masters looks better now than it did at the time...).
Zverev - currently at 1 final lost to Thiem (painfully...) at the 20 USO, 5 further semis, 4 further quarters.
SF losses to Thiem (20 AO), Tsitsipas (21 FO), Novak (21 USO), Rafa (22 FO... the one where the knee popped out) and Ruud (23 FO).
QF losses to Thiem (18 FO), Novak (19 FO), Novak (21 AO) and Alcaraz (23 USO).
He's up to 5 Masters titles and two WTF titles.