Martin,Rios,Corretja,Pioline for sure, but Coria,Henman,Bjorkman are a bit of a stretch.Flipper actually reached 2 GS finals Wimby and US Open losing to Rafter and Federer.Rios has more talent than all the guys named,held #1 and that's without a ton of drive and imo wasted talent and distractions and he's 5'9",Martin cuz he's Mr.5 Setter and he's super nice and kinda a grinding big man whose been to 2 GS finals.Corretja cuz he has a beautiful game and ability to win one, but just has had some bad luck and reached 2 GS Roland Garros Finals.Pioline reached 2 GS finals,again has a beautiful game and some bad luck, but he reached Wimby and US Open with 5 years between them and his game was very versatile,he could outgrind grinders and outhit big hitters.
Coria hasn't shown enough promise besides a bunch of clay titles, but nothing spectacular at the French,but this comes at a time when Ferrero,Guga are still playing.Henman despite his grass court game might deserve to win one,becuase he came at a time when Sampras and Federer are playing well on grass.Sampras dominated Henman at the end of his career and now Federer has done the same in big events and majors.Bjorkman is just a journeyman doubles player who is a good singles player,but singles focus seems to detract from his doubles.He has won quite a bit of doubles titles and even a few GS titles.One of the things about doubles is that doubles players are good on any surface(Bjorkman reached the final or won at every GS from grass,rebound ace,red clay,etc.)