Anne Keothavong moved into the second round of Wimbledon for only the third time in her career as she overcame compatriot Naomi Broady 6-2 6-4.
Broady, 21, started off confidently on Court 12, but her morale soon dipped and she lost three straight games, to see Keothavong take the opening set.
British number three Keothavong broke the serve of the Stockport-born youngster in the fifth game of the second set and held out to confirm a second-round clash with Petra Kvitova, a semi-finalist last year.
Broady showed no signs of inexperience early on as she flashed down serves of 117mph to take the first game but then failed to take a break-point opportunity in the next which might have allowed her to take a grip of the set.
Rescuing the second game proved to be the catalyst for 27-year-old Keothavong, who saved a break point on her own service before breaking her opponent with a passing forehand that crept inside the line in the fifth.
Angered by a number of wasteful returns, Broady lost her composure and saw the next three games slip by and the set was lost.
Broady looked determined to break Keothavong after holding her own serve at the start of the second set, but a couple of unforced errors from the back of the court by the Lancastrian left the score at 1-1.
Broady saved a break point in the 11th game but lost her third service game of the match after spooning a backhand long.
Keothavong, who beat Broady in Nottingham three weeks ago, powered a forehand down to clinch her service game, leaving Broady to serve for her survival.
The world number 213 slammed a backhand into the net to give Keothavong a match point, but the Londoner failed to take advantage and Broady held on to trail 5-4.
Hackney-born Keothavong gained a match point by putting away two well-placed forehands and a cross-court backhand, but Broady took the game to deuce with a stabbed volley at the net.
Broady groaned as her forehand gave Keothavong another match point and this time she did not fail as her young opponent hit a backhand long.
Broady, clearly upset at the manner of the defeat, left the court in tears.