By losing, Ostapenko joins a ignominious group including, as well as Myskina, Steffi Graf, Jennifer Capriati, Svetlana Kuznetsova and Angelique Kerber who all lost as Grand Slam champions on the first run of their defences.
The former swept past Svetlana Kuznetsova while Agassi bulldozed fellow-American Brian Vahaly in the first round of the Australian Open.
American Madison Keys overcame late leads by Svetlana Kuznetsova in both sets to defeat the Russian for the Cincinnati Masters title on Sunday.
The Serbian second seed's match against France's Adrian Mannarino was delayed because of the epic five-setter between Gilles Muller and Rafael Nadal.
Photos from the matches played at the Miami Open on Monday
World No 1s Andy Murray and Angelique Kerber have been named top seeds for the first major of the season, Australian Open, which will commences on January 16.
Angelique Kerber continued her relentless march towards a maiden WTA Finals crown with a comprehensive 6-2, 6-1 victory over defending champion Agnieszka Radwanska on Saturday to set up a title showdown against Dominika Cibulkova.
Former world number one Serena Williams returns to Grand Slam action for the first time in over 15 months, when she goes up against Czech Kristyna Pliskova in the French Open first round.
World No 2 Rafael Nadal sailed into the quarter-finals of the China Open, his first tournament in 13 weeks, with a 6-3, 6-4 win over German qualifier Peter Gojowczyk on Thursday.
Britain's Johanna Konta faces an anxious 24-hour wait before discovering whether she will make her debut at the WTA Finals in Singapore.
Maria Sharapova remained on course for consecutive Madrid Open titles when she recovered from dropping the second set to beat Caroline Wozniacki 6-1, 3-6, 6-3 on Thursday and book a spot in the semi-finals.
World number three Karolina Pliskova overcame a stern test to reach the semi-finals of the BNP Paribas Open on Wednesday after edging French Open champion Garbine Muguruza 7-6(2), 7-6(5) at Indian Wells.
Djokovic continues to lead ATP Rankings
Poland's Agnieszka Radwanska stayed patient in the face of a barrage of big serving to advance to the last four of the WTA Finals for the third time in a row with a 7-5, 6-3 victory over Karolina Pliskova on Friday.
Breeze though the outfits that caught the maximum shutterbugs at the final Grand Slam of the year.
Serena Williams remains the 'queen' of women's tennis but don't be surprised if she's no longer No 1 by the end of the year, Martina Navratilova said Thursday.
India's Rohan Bopanna and his Romanian partner Florin Mergea entered the Sydney International final after a straight sets win over Thomaz Bellucci and Leonardo Mayer, on Friday.
Kuznetsova unable to defend Washington title over 'visa issues'
Indian tennis ace Sania Mirza and her Swiss partner Martina Hingis continued to display their rampaging form as they extended their winning streak to 32 after progressing through to the third round of the Australian Open in the women's doubles event on Saturday.
Venus Williams also went the distance before claiming a 2-6, 6-3, 6-3 victory over Croatia's Donna Vekic.
Following Iga Swiatek's victory over Coco Gauff in the final, here's a list of French Open women's singles champions:
World No 1 Serena Williams comfortably beat 15-year-old CiCi Bellis.
Key facts and records of American Serena Williams and Canada's Bianca Andreescu
Serena Williams won her 750th career match to stay on track for her ninth Miami Open title when she beat Zarina Diyas of Kazakhstan 7-5 6-3 in the third round in Florida on Saturday. The world number one improved her career record to 750-125, seventh on the all-time list and just three match wins behind Lindsay Davenport's 753. Martina Navratilova sits atop the all-time list with 1,442 wins. The 34-year-old Williams will meet Russian Svetlana Kuznetsova in the fourth round. The 15th seed defeated France's Caroline Garcia 4-6 6-2 7-6(6). Unlike the last time they met, when Williams required 54 minutes and Diyas won just two games, the 22-year-old Kazak gave the American some trouble in the heat and humidity of Miami.
The German sixth seed, who has not won a title since winning at Flushing Meadows last year, never got into the match against the 2016 WTA newcomer of the year.
Zverev's serve played a big role in the victory, his third of the year, as the World No 3 won all but two of his first-serve points in the final, which lasted 74 minutes.
Rediff.com presents matches that shook up US Open.
World number one Naomi Osaka will "probably" defend her US Open title, even if it means defying her doctor's orders.
A summary of sports events and sports persons, who made news on Friday.
As the players warm up before the tournament, meet the players who could well be contenders for the 2017 Australian Open titles.
Rafael Nadal celebrated his 1,000th tour level match with a come-from-behind victory over German veteran Philipp Kohlschreiber to reach the fourth round of the Miami Open.
Andy Murray embarks on his first Grand Slam campaign as world number one with much stronger title credentials, even if he has lost five finals at Melbourne Park.
World number four Stan Wawrinka began the new season with a straight-sets victory over Viktor Troicki in his Brisbane International debut on Wednesday. Second seed Wawrinka edged out Troicki 7-6(5) 6-4 to maintain his perfect record against the Serbian whose seventh attempt at beating the Swiss failed at the Pat Rafter Arena. "I'm quite happy with my level at the start the year," Wawrinka said.
Rafael Nadal's return to action came to a shuddering halt on Friday when the Spaniard was beaten by Slovakia's Martin Klizan in a late-night quarter-final duel at the China Open.
World No 1 Serena Williams kept her Wimbledon title defence on track on Sunday, downing Germany's Annika Beck 6-3, 6-0 with a crushing display of power and booming serves.
Novak Djokovic extended his unbeaten start to the season to 15 matches as he swatted aside German veteran Philipp Kohlschreiber 6-3 6-1 with ease on Wednesday to reach the Dubai Tennis Championships quarter-finals.
Top seed Angelique Kerber was knocked out of the last-16 of Wimbledon by Garbine Muguruza on Monday, ensuring she will lose her world number one ranking.
Russia's Elena Vesnina ousted German second seed Angelique Kerber 6-3, 6-3 to reach the quarter-finals of the BNP Paribas Open at Indian Wells, California on Tuesday.
Serena, a six-times champion in New York who is seeded 17th, will start her campaign against Polish world number 60 Magda Linette and could face Venus in the third round before a possible fourth-round showdown with Romanian top seed Halep.
Maria Sharapova has pulled out of Russia's Fed Cup semi-final against Germany in Sochi this weekend with a leg injury, the Russian Tennis Federation said on Tuesday.
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