TORONTO, Canada - Rising teenager Dayana Yastremska's quick progress along her WTA learning curve continued apace at the Rogers Cup with a 6-3, 6-2 upset of No.13 seed Johanna Konta from a break down in the first set.

The 19-year-old had lost to Konta 6-2, 6-4 just two months ago in the first round of Eastbourne, and in a match of few rallies dictated by raw power initially demonstrated inferior control. But Yastremska was able to make rapid adjustments - aided by a well-timed on-court coaching session - to reel the Briton in and ultimately outgun her.

The keys, she said afterwards, were "to be focused, to be stable, to be really patient and to be in good shape". At Eastbourne, Yastremska admitted, "I wasn't on court - I was away in my mind" - but, having had a glimpse of how Konta played, she had been better able to prepare herself both tactically and physically today.

Yastremska also revealed a surprising source of inspiration - 12-year-old sister Ivanna, who is taking her first steps into junior tennis this week. 

"My younger sister really motivated me today," said the 2016 Wimbledon girls' finalist. "She won her first match today in Tennis Europe U12s [over Constanza Fernández Rincón in El Prat de Llobregat] 6-3, 6-2 - so when I won the first set today 6-3, I said to myself, I have to challenge myself and win the next 6-2 like she did. So today we both got the same score!"

Ivanna's success already has the elder Yastremska looking ahead: "Maybe one day we're going to play doubles together!"

In her own tournament, the opening stages of the match were dominated by oscillating form from both: service winners and blazing returns alternated somewhat unpredictably with double faults and loose groundstrokes, with the latter putting Yastremska down the first break. But Konta repaid her opponent in kind immediately - and a couple of games later, after the young Ukrainian had sought advice from coach Olivier Jeunehomme on her return position, the Hua Hin and Strasbourg champion struck.

Punishing Konta's second serve and backing her returns up with bold net-rushing, Yastremska captured the Roland Garros semifinalist's delivery on her own terms, and a game later caught Konta out with a surprise delicate touch to close out the set.

After staving off two early break points, Yastremska went from strength to strength in the second set, drawing gasps with the sheer pace of her forehands down the line - but also displaying some audacious reflexes with a few redirected backhand winners, delivered from a squatting position à la Agnieszka Radwanska. On return, the World No.33 pressured Konta not only with power but with relentless depth that frequently elicited shanked responses from the 28-year-old - and she was rewarded on two straight Konta service games as she broke twice to blaze to the brink of victory.

Serving the match out was something of an adventure for Yastremska, despite reaching triple match point in the blink of an eye with three service winners: it ultimately took her five match points to get over the line, with two break points having to be saved. Still, they at least provided Yastremska with extra canvas to show off some more tricks under pressure: the delicately angled reflex volley with which she saved the second was one of her finest shots of the day.

Up next for Yastremska will be another stern test in the form of either former World No.1 Victoria Azarenka or Washington finalist Camila Giorgi. "I'm going to see how they play each other first," said Yastremska of the potential matchups: she has played the Italian twice, emerging with a 1-1 head-to-head, but was quick to point out that with their past encounters coming on clay and grass, "it will be completely different". As for Azarenka, there is no official history - but, Yastremska revealed, there was a practice session in Miami to draw on.

"We played a couple of games - it was OK," she mused.