the next four games
to lead 5-2 behind powerful winners such as a forehand down the line winner and an overhead winner.
Alcaraz leveled the set at five games all before Goffin held serve to lead again 6-5.
Serving to stay in the set, Alcaraz found himself on the defense as he had been for much of the set.
Alcaraz struck an inside out crosscourt forehand wide to reach 15-30 before striking an inside out down the line forehand long to trail 15-40 and face set point.
Alcaraz netted a down the line backhand to end an extended rally and the set after 59 minutes of play.
Continuing in set two with his high level of play and deep groundstrokes, the 31 year old Goffin held serve in the opening game to lead 1-0.
With Alcaraz then serving down breakpoint, Goffin struck a powerful inside out down the line forehand which forced Alcaraz to hit a difficult crosscourt forehand while on the run which he netted to drop serve and trail 0-2.
The set remained on serve in the following three games with Goffin maintaining the lead at 4-1.
Alcaraz netted a crosscourt backhand before striking a crosscourt forehand long, his 31st unforced error of the day to reach 0-30.
The Spaniard then netted two forehands to drop serve and trail 1-5.
Alcaraz won the following two games to reach 3-5 before Goffin served for the match a second time.
At 30 all, Goffin struck a down the line backhand passing shot winner to reach matchpoint.
Alcaraz struck a down the line forehand volley wide to end the match; his only straight sets loss of the year.
Alcaraz finished the match with 34 unforced errors to 15 winners.
Goffin, a Wimbledon quarterfinalist this year, hit 19 winners to 23 unforced errors.