Xinjiang restrained Shanghai to five points in the first quarter and 18 at the break on the way to winning the game.
Cadiz had lost their previous 13 league visits to Athletic Bilbao.
"It's because I did a lot of things well. I played more aggressively than the previous days. I went to the net more often, and I hit a lot of winners," added the 12-time French Open champion, who needed only one hour and 35 minutes to see off his opponent.
Earlier on Friday, Jiangsu defeated Shanghai 3-0 (25-17, 25-20, 26-24) in the third-place match.
Jiangsu were placed second in the group after the third round.
"But I take it as a very positive thing. I am playing quite well to win against a player like Stefano today with this score.
For Chinese sports fans, their demand for sports events was suppressed for nearly half a year.
Many put the performances down to Garitano's defensive and conservative nature and his unwillingness to show confidence in the club's young players. The feeling is that although the squad has obvious weak points (especially in central midfield), the lack of confidence some players showed in the last two games means Garitano is running out of time. Enditem
The pair have not played for their country since the Cafeteros' penalty shootout defeat to Chile in the quarterfinals of last year's Copa America in Brazil.
The Iranian giant advanced to the ACL final with a 5-3 win on penalties against Al Nassr after the West Zone semifinal ended 1-1 in 120 minutes at the Jassim bin Hamad Stadium on Saturday.
Shandong built a 17-7 lead at the beginning of the second set, while Tianjin found it difficult to erase the deficit.