Undeterred, the Blues regained the lead in spectacular fashion just two minutes later, when Reece James unleashed a long-range effort that flew into the top corner for his first ever Premier League goal.
Valencia got a flying start to the season a week ago when they twice fought back from behind before winning 4-2 at home to Levante, and another fightback looked to be on the cards when Maxi Gomez scored an impressive goal in the first minute of the second half following a pass from Daniel Wass.
Elsewhere, Eintracht Frankfurt shared the spoils with newly-promoted Arminia Bielefeld following a 1-1 draw. Augsburg downed Union Berlin 3-1 with two late goals, while Freiburg secured a 3-2 victory over newly-promoted Stuttgart. Enditem
Despite the defeat, Al-Taawoun remain top of Group C thanks to a superior head-to-head record over second-placed Al-Duhail SC, who beat Sharjah FC 2-1 earlier in the day to reach six points, while Persepolis climb above Sharjah into second place with four points, just two behind the group leaders at the stage's halfway point.
Two minutes into the second half, Matheus Pereira curled home an excellent free-kick to level the scores, but Everton were soon back in front when Michael Keane prodded home from close range, and the home side then ran riot, with Calvert-Lewin netting twice more to complete his first hat-trick for the club.
Bale returns to the club he left to join Madrid in 2013 for a then-world record transfer fee of over 110 million U.S. dollars.
Bas Dost (R) of Frankfurt vies with Amos Pieper of Bielefeld during a German Bundesliga match between Eintracht Frankfurt and Arminia Bielefeld in Frankfurt, Germany, Sept. 19, 2020. (Photo by Kevin Voigt/Xinhua)
15th seed Grigor Dimitrov of Bulgaria eased past Italian wildcard Gianluca Mager 7-5, 6-1, while Marin Cilic rallied to beat Kazakhstan's Alexander Bublik 6-7 (4), 6-2, 6-4 to set up a second round meeting with sixth seed David Goffin.
According to the FIVB, due to the COVID-19 pandemic and subsequent uncertainty regarding travel and fan attendance, they decided not to stage the 2020 edition of the event.
As expected, Barcelona star Lionel Messi heads the list, with Juventus forward Paulo Dybala and Inter Milan striker Lautaro Martinez also included.
"We had two big chances in the first half but Dortmund were more effective and clinical in front of the target today," Monchengladbach head coach Rose said.