Fonseca cruised through the first set before Fearnley found his groove in the second to level the match on a windy day in the California desert.
Learner Tien is the youngest American man to reach the third round of the Australian Open since an 18-year-old Pete Sampras in 1990.
Novak Djokovic was stunned 7-6(4), 6-2 by Matteo Berrettini in the Qatar Open first round on Tuesday as the Italian enjoyed his first win over the former world number one.
A round-up of all the tennis action from around the globe.
Bopanna had scripted history in March to become the oldest ATP Masters 1000 champion when he and Ebden won the BNP Paribas Open.
World number one Iga Swiatek blasted past American Danielle Collins 6-3, 6-0.
Sweden and Novak Djokovic's Serbia took the two best runners-up spots and a place in the last eight by virtue of their better match win-loss records among the second placed sides throughout the group stages.
A stellar season thus far has propelled the 43-year-old into the top 15.
Cilic had never made it past the quarters in Paris but has now made the semis or better at all four majors.
Images from the US Open men's singles second round matches, at Flushing Meadows, New York, on Wednesday.
World number one Jannik Sinner delivered a flawless performance to pulverise Czech Jiri Lehecka in straight sets in little more than 90 minutes on Saturday.
Earlier, title holder Borna Coric beat American Sebastian Korda 7-6 (5), 6-4, while another home hope Taylor Fritz survived a first-set thriller to beat Czech Jiri Lehecka 7-6 (14), 6-2.
Talk about a man in a hurry -- 10th seed Ben Shelton required just 55 seconds to finish off Australian Rinky Hijikata and reach the Wimbledon third round on Friday.
Carlos Alcaraz suffered a shock 6-1, 7-5 defeat against Norway's Casper Ruud in his opening match at the ATP Finals
How the winners celebrated on Day 11 of the French Open.
WTA chief promises 'strong reactions' to ban on Russian, Belarusian players
Jannik Sinner made it two wins out of two at the ATP Finals as he fought off Taylor Fritz in a high-octane clash inside the Inalpi Arena on Tuesday.
Daniil Medvedev fired Russia to victory in the $7.5 million ATP Cup with a dominant performance against Italy in Melbourne on Sunday.
The duo of Rohan Bopanna and Denis Shapovalov crashed out of the semi-finals of the men's doubles event at the ongoing St Petersburg Open St Petersburg on Saturday.
Novak Djokovic was shocked by Botic van de Zandschulp 6-2, 3-6, 6-1 in the second round of Indian Wells on Saturday as the Serbian suffered an early exit at the hands of a tournament lucky loser for a second consecutive year.
Images from the second day at the US Open, the final Grand Slam tournament of the year.
IMAGES from the US Open matches played on Day 1 at the Flushing Meadows in New York on Monday.
It was only Alcaraz's third tournament on grass, but the way he marched through the draw augurs well for his prospects at Wimbledon, where he will be seeded number one.
After a mature performance against ninth seed David Goffin, the 19-year-old set up an intriguing last-eight showdown with world number one Rafael Nadal.
The Americans found their rhythm to wrap up a final-day victory
Alcaraz topped the Red Group and will face Green Group runner-up Novak Djokovic in a mouth-watering semi-final.
Sinner won in Cincinnati this week to claim his fifth title of a breakout season before the revelation that he avoided a ban over two positive tests
A defiant Rafael Nadal won an all-Spanish clash of the generations taming teenager Carlos Alcaraz 6-4, 4-6, 6-3 to stretch his winning run to 20 matches on Saturday and clinch a place in the Indian Wells final. He will take on American Taylor Fritz in Sunday's championship in the California desert where a victory would see the 35-year-old equal Novak Djokovic's record of 37 ATP Masters 1000 titles.
World number one Carlos Alcaraz faces a potential quarter-final clash with old foe Jannik Sinner in his US Open title defence, and American Coco Gauff is on a collision course with defending champion Iga Swiatek on the women's side.
Twenty four time Grand Slam champion Novak Djokovic closed the 2023 ATP season by clinching the year-end No. 1 spot for a record-extending eighth time.
Fourth seed Grigor Dimitrov survived a scare against Pierre-Hugues Herbert before holding his nerve to win 3-6, 6-2, 6-4 in the second round of the Monte Carlo Masters on Tuesday, while Dominic Thiem edged out Russian youngster Andrey Rublev.
Novak Djokovic continues his hunt for a fifth straight Wimbledon title and eighth overall to equal Roger Federer's record haul when the Serbian meets Jannik Sinner.
Goran Ivanisevic, Djokovic's coach, was greeted with jeers from fans when he broke the news courtside.
Images from Day 2 of the 2023 Australian Open at Melbourne Park on Tuesday.
Daniil Medvedev, the 2021 champion, will need to shake off a run of poor form if he is to mount a challenge.
In the men's singles draw five-time champion Novak Djokovic headlines the top half of the draw and shares a quarter with Russian No.5 seed and recent Halle finalist Andrey Rublev.
First launched in 1924 and celebrating its centenary next year, the Wimbledon Ballot is intended to be the fairest means of obtaining tickets for The Championships.
Novak Djokovic grabbed a two-set lead in his fourth round match against Hubert Hurkacz before play was suspended at Wimbledon on Sunday.
Novak Djokovic's erratic form, Rafael Nadal's fitness woes and untimely injuries to top-ranked youngsters have set up an uncertain French Open men's tournament
Former world number one Andy Murray eased past Rafael Nadal in the Spaniard's comeback match at the World Tennis Championship exhibition tournament in Abu Dhabi on Friday.