Selby, 37, reached his 27th career ranking final after defeating China's top player Ding Junhui and compatriot Shaun Murphy back-to-back on Saturday.
Sergio Ramos won the game for Madrid with an 82nd minute penalty awarded through VAR after Marc Bartra was judged to have handled a ball from Borja Mayoral, although nobody had appealed for the foul.
"I really wanted to give an effort here. It's my Achilles that didn't have enough to properly heal after the [US] Open. I was able to get it somewhat better, but just looking long-term in this tournament, will I be able to get through enough matches? For me, I don't think I could," said the three-time Roland Garros champion.
"We are exhausted," the 32-year-old Pole said after the Bavarian lost 4-1 in Hoffenheim.
Jiangsu won their sixth straight game and advanced as the pace-setter in group A.
Hoffenheim then grabbed the lead out of the blue with 16 minutes gone when Ermin Bicakcic headed home Dennis Geiger's corner kick to stun Hansi Flick's men.
The Brazilian, who had entered the game as a substitute, took advantage of a loose ball to beat Valladolid keeper Roberto Jimenez with a diagonal shot.
Also, Iran's Super Cup will be held between IPL champions Persepolis and Hazfi Cup winners Tractor soccer clubs on October 18. Enditem
Striker Bi Jinhao scored a brace in the first half to seal the win for the Shanghai side in the last round of the first CSL phase.
Boca had 68% of possession and seven shots on target to Libertad's one, in what was largely a lopsided contest at La Bombonera.
MADRID, Sept. 30 (Xinhua) -- A 65th minute goal from Vinicius Jr gave Real Madrid a 1-0 win at home to Real Valladolid in the fourth round of matches in La Liga on Wednesday night.