Dominik Greif, the man guarding the visitor's goal on the opposite end, erased the home team's greatest scoring chance in a similar manner in the 81st minute after a square pass attempt.
Elsewhere, Russia's Andrey Rublev beat Argentinian qualifier Facundo Bagnis 6-4, 6-4 and will meet Poland's Hubert Hurkacz in the next round.
The Celta captain opened the scoring from Nolito's pass after 15 minutes in an entertaining match which saw Celta play some impressive football.
In Saturday's early kick-off, Arsenal brushed past newly-promoted Fulham 3-0 at Craven Cottage, with new signings Gabriel and Willian both impressing.
From then on, Arsenal were firmly in control, and took the lead in the 8th minute when Alex Lacazette bundled home from close range.
"I always try to push him to do things he didn't know he can do. His potential is huge," the Pole said and spoke about sprint duels he has started in training in order to challenge the 25-year-old German international.
In the day's later fixture, Hellas Verona shared the spoils with Roma in a 0-0 draw, with both sides hitting the woodwork three times. Enditem
Much of the pre-match talk has been about the role Martin Odegaard could play after the Norwegian's successful loan spell at Real Sociedad earned him a quick return to the Santiago Bernabeu.
Thiago's arrival will give Liverpool further midfield options and variety alongside Jordan Henderson, Georginio Wijnaldum, Naby Keita, Fabinho, Alex Oxlaide-Chamberlain and the veteran James Milner, although Barcelona are rumored to be interested in taking Wijnaldum to the Camp Nou. Enditem
"Thanks to my strategy -- following the leader at first, taking the opportunity when chance appeared. I ran men's 10,000m race on Wednesday, it helped me to heat it up," said 24-year-old Peng.
Stage One will be played across two blocks of eight days: September 13-20 and September 28-October 5. Enditem