It's usually hard for qualifiers to do much in the main draw of ATP tournaments, being already tired after playing the qualifying rounds, but sometimes everything does go just like they would wish. The reasons can be various as players get used to the court and conditions, either because they comeback from injury or because they just miss the main draw by only a few ranking places.
All in all, this season, some of those who went through the qualifying rounds made very deep runs in the main draw, fighting even for the title in some cases. Here is the list with 26 players who reached at least the quarter-finals of the ATP tournaments in 2015, but needed to qualify first: * Chennai (250) - Aljaz Bedene (Final)
* Sydney (250) - Viktor Toricki (Title) / Mikhail Kukushkin (Final)
* Auckland (250) - Jiri Vesely (Title)
* Montpellier (250) - Steve Darcis (Quarter-finals)
* Memphis (250) - Austin Krajicek (Quarter-finals)
* Sao Paulo (250) - Luca Vanni (Final)
* Delray Beach (250) - Yoshihito Nishioka (Quarter-finals)
* Acapulco (500) - Ryan Harrison (Semi-finals)
* Dubai (500) - Marsel Ilhan (Quarter-finals)
* Casablanca (250) - Aljaz Bedene (Quarter-finals)
* Munich (250) - Gerald Melzer (Semi-finals)
* s-Hertogenbosch (250) - Nicolas Mahut (Title) / Illya Marchenko (Quarter-finals)
* Stuttgart (250) - Mischa Zverev (Quarter-finals)
* Newport (250) - Jan Hernych (Quarter-finals)
* Bastad (250) - Paul-Henri Mathieu (Quarter-finals)
* Atlanta (250) - Denis Kudla (Semi-finals)
* Hamburg (500) - Lucas Pouille (Semi-finals)
* Kitzbuhel (250) - Paul-Henri Mathieu (Final)
* Montreal (Masters) - Ernests Gulbis (Quarter-finals)
* Cincinnati (Masters) - Alexandr Dolgopolov (Semi-finals)
* Winston-Salem (250) - Pierre-Hugues Herbert (Final)
* Tokyo (500) - Austin Krajicek (Quarter-finals)
* Valencia (250) - Mischa Zverev (Quarter-finals) / Daniel Brands (Quarter-finals) The Grand Slams are the only category not featured in the list.
Only four qualifiers made it to the second round of the Australian Open, three of them losing in straight sets including Tim Smyczek, who played a great match against Nadal, losing closely 7-5 in fifth set. It was even harder for them to better in Paris, since only Arnaboldi and Edmund reached the second round.
The Briton wasn't even able to play in the second round and the Italian lost to Cilic in straight sets. Things were little better at Wimbledon, where qualifier Dustin Brown stunned Rafael Nadal but lost in third round, just like Nikoloz Basilashvili.
Four qualifiers passed the first round of the US Open but in the next round only Marchenko managed to win a set. In balance, qualifiers couldn't perform miracles at the biggest stage, or come close to repeating what Tomic did in 2011 (he was on verge of defeat in first round of qualification, but made it to the quarter-final of main draw) or what Vladimir Voltchkov did 11 years earlier, reaching the semis of the 2000 Wimbledon.