Sevastova, clearly unhappy with her performance, battled back in the second set, managing a break of her own and winning three games in a row to take a 3-1 lead. "I feel like I'm seeing the ball very big and am moving well".
The Slovakian player is aiming to improve on her run to the quarter-finals a year ago.
French Open champion Jelena Ostapenko fought back despite a string of errors to beat Canadian qualifier Francoise Abanda 4-6 7-6 (4) 6-3 and reach the third round at Wimbledon for the first time.
Arab states disappointed with Qatar's 'negative' response to list of demands
Any further steps taken against Qatar would be "taken at the appropriate time" and be "in line with worldwide law". He said the demand shows "a lack of respect toward us and Qatar ".
She has reached the third round of Wimbledon twice before, losing to Serena Williams in a three-set thriller in 2015. I just am happy with that.
Speaking about the recent wave of players pulling out of matches injured, Watson told the paper she "could not retire during a match".
"I'm just going to go out there and play my match". She definitely is going to be a crowd favorite.
Week ahead promises sun, warmth, chance of thunder
Sunday night , there will be a 40 percent chance of showers and thunderstorms, with a low of 69, according to the weather service. Saturday night: Showers and thunderstorms likely before 2am, then showers likely and possibly a thunderstorm after 2am.
It promises to be a fine contest and Watson will fancy her chances given Azarenka's lack of match practice.
Watson will next face Victoria Azarenka after the Belarussian, back on tour after giving birth to her first child in December, ousted 15th-seeded Russian Elena Vesnina.
The Brit was able to keep up her high quality of play in the second set as she eventually sealed a 6-0 6-4 victory over the Latvian, "Starts are very important, but I'm really happy with the second set because she raised her level". I had to expect that she would raise her level after the first set and I just had to remain calm and adjust my game.
Arsenal edge nearer to Alexandre Lacazette deal?
Lyon's Alexandre Lacazette over recent season's has displayed why he's considered one of the best strikers in Europe. The options? "It'll either be a France global or a player from a very big European club".
Great Britain's number one saw success in the second round to progress to the third for the first time in her career.