Yes. Turns into a choker when things get real close in important matches. Not blowing big leads Cilic-style, but still managing to come up short when it really matters.
Not showing up in WTF 09 final.
Didn't deliver in deciding tiebreaks in Montreal 2009 and Shanghai 2013.
Lost a set and a break lead against Rusty Nadal in Indian Wells 2013.
Didn't finish off Federer in Olympics, a match where Fed was so nervous he played near amateur level.
Played strong in the Wimbledon 2013 semifinal, but never made a decisive break through to take the match in hand. Didn't look like he really dared to win.
Loses against Murray in final of Olympics, despite beating much tougher opponents before that while Murray nearly lost to Fognini and some nameless player.
Totally fell apart against Nadal at USO 2017 after taking first set, first time in ages where he had a realistic shot at winning another slam.
Wasted a one set lead against Federer in Shanghai, despite overpowering him initially.
Did the same thing in Basel, against a Federer who was visibly nervous and agitated and ripe for the taking.
The chokes are not obvious at first sight, but there's a clear pattern there. His USO 09 win is the odd one out, with some big help from Federer.
I recognize he's had huge problems with injuries. But the losses above can't be attributed to injuries. If not for injuries the list above would probably have been longer.