Selby revealed that one of his targets this season is to get to number one in the world rankings.
Vinicius Paiva put the hosts ahead by tapping home just after halftime before Lucas Evangelista equalized with a long-range effort.
Alcacer then showed neat footwork halfway through the second half to ensure the points for Villarreal and leave Alaves in trouble.
A favorable group draw for the 2020-21 Champions League completed the Bavarians' perfect day, as they will meet Atletico Madrid, RB Salzburg, and Lokomotiv Moscow in Group A.
The game had already seen more than its fair share of drama after Solly March had headed Brighton level in the 95th minute, when it had looked as if a Lewis Dunk own goal and a cool finish from Marcus Rashford would give Ole Gunnar Solskjaer's men three points after Neal Maupay had put the home side in front from the penalty spot.
The two sides were locked in a stalemate at the beginning of the third set but after reaching a tie of five, Shanghai scored six in a row and finally won the third 25-19 to reach the semifinals.
Hamilton had started from pole position and held onto his lead despite the long run to the first braking zone exposing him to attack from Bottas and Red Bull's Max Verstappen.
In a tightly contested first quarter, the two sides saw many lead changes before it was knotted at 21-all.
The swimmers' performances at the championships will act as an important reference for their qualification for next year's Tokyo Olympic Games. Enditem
Players of Al Ahli Saudi FC celebrate after winning the AFC Asian Champions League round of 16 match between Al Ahli Saudi FC of Saudi Arabia and Shabab Al Ahli Dubai of United Arab Emirates in Doha, capital of Qatar, Sept. 26, 2020. Al Ahli of Saudi Arabia defeated Shabab Al Ahli Dubai 4-3 on penalties to progress to the quarterfinals. (Photo by Nikku/Xinhua)
CHENGDU, China, Oct. 1 (Xinhua) -- It took Shandong just one quarter to seal their opening victory in the Women's Chinese Basketball Association (WCBA) league new season by overwhelming Daqing 101-51 here on Thursday.