Grand Slam champions Daniil Medvedev and Naomi Osaka registered straightforward victories on Day 8 of the Miami Open.Medvedev beat Pedro Martinez to reach the fourth round of the competition, while the Japanese got the better of Alison Riske to book her place in the last eight.The likes of Stefanos Tsitsipas, Iga Swiatek, Petra Kvitova and Paula Badosa also won their respective matches. Ons Jabeur was the only top-10 seed to be eliminated after she lost to Danielle Collins.Here are the major results from Day 8 of the 2022 Miami Open:Medvedev eases past MartinezMedvedev sealed his place in the last 16 of the Miami OpenTop seed Daniil Medvedev beat Pedro Martinez 6-3, 6-4 in an hour and 20 minutes to book his place in the last 16 of the Miami Open. Medvedev has been in fine form in Miami following a disappointing exit at Indian Wells. The Russian will now face Jenson Brooksby for a place in the quarterfinals.We Are Tennis@WeAreTennisJob done Daniil Medvedev takes down Pedro Martinez in a 1h20 match to meet Bautista vs Brooksby winner in Miami 4th round11:10 AM · Mar 28, 20221079Job done ✅Daniil Medvedev takes down Pedro Martinez in a 1h20 match to meet Bautista vs Brooksby winner in Miami 4th round https://t.co/AkPSLHrlJFTsitsipas battles past De MinaurStefanos Tsitsipas booked his place in the last 16 of the Miami Open by defeating 25th seed Alex de Minaur. Both players served well early on, before the Greek earned the decisive break in the 10th game to clinch the opening set.The Aussie looked to bounce back in the second and had a few break points in Tsitsipas' first two service games. However, he could not capitalize on them. The 23-year-old then broke de Minaur in the fourth game to go 3-1 up.The break proved to be decisive as Tsitsipas took the second set 6-3 to book his place in the fourth round, where he will face Spanish sensation Carlos Alcaraz.Swiatek cruises into last 8Iga Swiatek continued her impressive run of form, beating Coco Gauff 6-3, 6-1 to seal her place in the quarterfinals. The Pole has now won 14 matches on the trot and has dropped only nine games in Miami so far. She will square off against Petra Kvitova in the quarterfinals.Osaka continues fine run in MiamiNaomi Osaka continued her good run at the Miami Open as she beat Alison Riske 6-3, 6-4 to reach the quarterfinals. The Japanese saved four break points in the opening game of the match before breaking the American to go 2-0 up. Osaka took the first set 6-3 but was broken early in the second set.However, she took the next four games and won the set 6-4 to seal her place in the quarterfinals, where she will take on ninth seed Danielle Collins.WTA Insider@WTA_insiderNaomi Osaka returns to the #MiamiOpen QFs for the 2nd time in her career and will face Danielle Collins for a spot in her 1st Miami SF. Osaka fired 40 winners in her 63 64 win over Alison Riske in the R16, her highest winner tally in a WTA match since 2020.2:49 AM · Mar 29, 202233734Naomi Osaka returns to the #MiamiOpen QFs for the 2nd time in her career and will face Danielle Collins for a spot in her 1st Miami SF. Osaka fired 40 winners in her 63 64 win over Alison Riske in the R16, her highest winner tally in a WTA match since 2020. https://t.co/aSPsBi1hpHMiami Open 2022: Day 8 results at a glanceMen's singles (third round):(1) Daniil Medvedev def. Pedro Martinez 6-3, 6-4Jenson Brooksby def. (15) Roberto Bautista Agut 6-3, 5-7, 6-4(8) Hubert Hurkacz def. (29) Aslan Karatsev 7-5, 4-6, 6-3Lloyd Harris def. (Q) Yoshihito Nishioka 7-6(5), 4-6, 7-5(14) Carlos Alcaraz def. (21) Marin Cilic 6-4, 6-4(11) Taylor Fritz def. Tommy Paul 7-6(2), 6-4Miomir Kecmanovic def. Sebastian Korda 7-6(4), 6-3(3) Stefanos Tsitsipas def. (25) Alex de Minaur 6-4, 6-3Women's singles (fourth round):(9) Danielle Collins def. (8) Ons Jabeur 6-2, 6-4(WC) Daria Saville def. (LL) Lucia Bronzetti 5-7, 6-4, 7-5Naomi Osaka def. Alison Riske 6-3, 6-4(22) Belinda Bencic def. Aliaksandra Sasnovich 6-2, 6-3(2) Iga Swiatek def. (14) Coco Gauff 6-3, 6-1(16) Jessica Pegula def. Anhelina Kalinina 6-0 (ret'd)(28) Petra Kvitova vs (21) Veronika Kudermetova 7-6(5), 6-4(5) Paula Badosa def. (WC) Linda Fruhvirtova 6-2, 6-3Men's doubles (second round):Fabio Fognini / Simone Bolelli def. Marcelo Melo / Ivan Dodig 2-6, 7-6(4), 10-8(3) Horacio Zeballos / Marcel Granollers vs Tomislav Brkic / Nikola Cacic 6-3, 6-4Women's doubles (second round):Sania Mirza / Kirsten Flipkens def. (7) Desirae Krawczyk / Demi Schuurs 6-2, 6-4Vera Zvonareva / Laura Siegemund def. (6) Giuliana Olmos / Gabriela Dabrowski 7-6(4), 6-3Ena Shibahara / Asia Muhammad def. Alicja Rosolska / Erin Routliffe 6-4, 3-6, 10-6(4) Coco Gauff / Caty McNally def. Xu Yifan / Alexa Guarachi 6-7(6), 7-6(6), 10-8Also Check Out: Miami Open 2022 Schedule