The 39-year-old, seeded seventh this 12 months, saved two set factors in a first-set tie-break earlier than successful 7-6 (8/6), 6-2.
Williams, who has misplaced 4 main finals since her final Slam success on the 2017 Australian Open, will tackle Begu’s compatriot Mihaela Buzarnescu within the second spherical.
“It wasn’t simple in that first set. I used to be up and I felt like I had some alternatives. She’s a very good participant, she’s had some actually good wins so I used to be actually pleased I used to be capable of get that first set and the match,” stated the three-time Roland Garros champion.
The primary official evening match underneath the lights on Court docket Philippe Chatrier was performed behind closed doorways on account of a 9pm curfew imposed by the French authorities on account of Covid-19.
Williams, who had suffered early defeats in each Roma and Parma earlier this month, improved because the match progressed.
Begu fought again from 5-2 down within the opening set, however didn’t serve it out when main 6-5 after which noticed two set factors come and go when main the breaker 6-4.
Williams wanted just one alternative, driving a forehand volley into the nook to take management.
The previous world primary strengthened her grip on the tie by breaking 74th-ranked Begu within the first recreation of the second set.
She moved by means of the gears on her personal serve from there and broke once more within the seventh recreation earlier than wrapping up victory after an hour and 42 minutes.