It has been such a sensational year for Novak Djokovic that he has only suffered four defeats - and three of them have come while "injured".
The latest was the most surprising as he was beaten 2-6 7-6 6-0 by Japanese youngster Kei Nishikori in the semi-finals in Basel just last weekend.
Djokovic was in cruise control during the opening set but then, after being broken while serving for it, the Serb called out the trainer for treatment on a shoulder injury.
There was no doubt that Djokovic was hurt - you could see it in his body language - but after having some gel rubbed into his shoulder he came out and broke Nishikori to take the opening set 6-2.
In the second set Djokovic's injury clearly diminished the quality of his play and not everything was finding the radar. Nishikori upped his game considerably too, and a real contest developed. Nishikori managed to break to go 2-3 up, but Djokovic fought back... and when he made it 4-4 he did this.
That is clearly the picture of a man who, while certainly hurting, was up for the battle, eager to win and move into the final (where he would have to play another match).
However, over the next few games something happened that has not happened to Djokovic much this season: he was outplayed.
Nishikori showed tremendous movement, excellent shot-making and, exploiting the errors that Djokovic was still making, went on to win the set 7-4 in a tie-break - and deservedly so.
What happened next was what upset Tramlines the most - Djokovic just gave up.
Nothing appeared to happen to worsen his injury from the end of the first to the end of the second set, but when the third set came along he simply wasn't interested.
There were times when Nishikori was able to fire winners past Djokovic with the Serb standing motionless, making no attempt to move towards the ball.
Djokovic may have hurt his shoulder in the match but there was nothing wrong with his legs, which made his lack of effort disrespectful.
There is an element of 'damned if you do, and damned if you don't' about retiring during a tennis match. If you quit, people will criticise; if you continue without putting in the effort, you will be similarly blasted.
However, Djokovic was clearly trying to win during the second set. Just look at that fist-pump. He wanted to move into the final and face Roger Federer in his own backyard - but then when things didn't go his way, he decided to pack it in.
It was an unfair course of action and puts an unwarranted asterix next to Nishikori's fantastic victory. People will dismiss the significance of the 21-year-old's win by saying: 'Oh, but Djokovic was injured - just look at how he played in the final set'... but that is unfair because Nishkori managed to outsmart and outplay a hungry and determined Djokovic in the second set.
We have been here before with Djokovic. The Djoker is all smiles and jokes when he is winning and people lap it up, but often when he is losing his body language becomes petulant and self-pitying and it is amazing how often his injuries seem to crop up when things are not going his way.
Djokovic is such an outstanding player - the best in the world by some distance at the moment - but a little bit more humility when things are not going his own way will do his legacy no harm.
The greatest sportsmen don't just win with class, they lose with honour.
+++
PICTURE OF PETRA KVITOVA CELEBRATING OF THE WEEK
We should start getting used to the sight of the Czech sensation celebrating as she is simply ripping through women's tennis at the moment. She was in absolutely sensational form at the weekend as she guided the Czech Republic to Fed Cup glory.
+++
EVEN THROUGH SUNGLASSES YOU CAN SEE THE LOVE IN HER EYES
Awww shucks - ain't they cute? Caroline Wozniacki watches boyfriend golfer Rory McIlroy play during the third round of the WGC-HSBC Champions golf tournament in Shanghai.
+++
SOMEONE STILL LOVES YOU DJOKOVIC
Tramlines expects to be hammered by Djokovic fans for this blog, but hey - it is still a great fan of the Serbinator. To prove it, here is a picture of some of his diehard fans in Basel.
+++
WHO CAN DO THE SPLITS?
Svetlana Kuznetsova can, as she proved during the Fed Cup final.
+++
ROGER FEDERER PICTURED HOLDING UP AN ATP TITLE - EPISODE NUMBER 68
Federer won the 68th title of his career in Basel. He is currently fourth on the all-time list behind John McEnroe (77), Ivan Lendl (94) and Jimmy Connors (109).
Follow Tramlines on Twitter.