Cori Gauff is still making her debut Wimbledon campaign seem like child's play.
The 15-year-old sensation, who beat Venus Williams in round one, continued her stunning progress by sweeping past former semi-finalist Magdalena Rybarikova.
Undaunted by playing under the lights of the Court One roof - the match did not begin match until 8.05pm - Gauff put in another nerveless display.
It may have been approaching her bedtime but the young American stayed utterly focused to secure a commanding 6-3 6-3 victory in an hour and nine minutes.
Rybarikova has slipped to 139 in the world but she certainly has pedigree, a seasoned grass-court player who made the last four just two years ago.
Gauff is no respecter of reputations, though. Nor is she lacking in confidence, having already declared she is here to win the tournament, and after three assured service games she switched up a gear and broke Rybarikova to love.
A hold to love clinched the first set, and she broke again for 2-1 in the second with Rybarikova unable to find an answer to the relentless, machine-like groundstrokes.
Rybarikova desperately wanted to force Gauff to serve out the match but she was having none of it, and as the weary Slovakian dumped a return into the net the teenager celebrated another hugely impressive victory.
Gauff will play world number 60 Polona Hercog in round three after the Slovenian beat 17th seed Madison Keys.
Third seed Karolina Pliskova demolished Monica Puig to reach the third round. The Czech took just one hour to wrap up a 6-0 6-4 victory over Puerto Rican Puig.
Next Pliskova will face Hsieh Su-wei, the 28th seed, who beat Kirsten Flipkens 7-6 (3) 6-3.
Russian Margarita Gasparyan left the court in tears after being forced to retire while leading against eighth seed Elina Svitolina.
The world number 62 was on the verge of a potential shock having won the first set and serving at 5-5 in the second.
But Gasparyan seemed to injure her knee and the 24-year-old had to give up.