The Melbourne Summer Set, scheduled to take place from January 4-9, is one of several tournaments being held in the lead-up to the 2022 Australian Open. The ATP 250 event will feature 20-time Grand Slam champion Rafael Nadal, who makes his return to the tour after six months.Nadal will be joined by the likes of David Goffin, Reilly Opelka, Grigor Dimitrov, Ilya Ivashka, Nick Kyrgios, and Andy Murray in the main draw.On that note, here's an in-depth look at how the action might unfold.Top half: Rafael Nadal handed easy draw on his return to competitive action2021 Australian Open: Day 10Seeded players: (1) Rafael Nadal, (4) David Goffin, (6) Ilya Ivashka and (7) Dominik KoepferExpected semifinal: Rafael Nadal vs David GoffinDark horses: Alexei Popyrin, Nick KyrgiosAnalysis: Rafael Nadal will be seen in competitive action for the first time since his injury-ridden run at the Citi Open in July. The Spaniard, who appears to have fully recovered from a foot problem, will be hoping to get plenty of matches under his belt ahead of the Australian Open.After a first-round bye, the top seed will face Marcos Giron or a qualifier in the second round. He could then come up against seventh seed Dominik Koepfer or local favourite Alexei Popyrin in the quarterfinals.Rafa Nadal@RafaelNadal🤫 Don’t tell anyone… … here I am 😉1:36 AM · Dec 31, 2021592954506🤫 Don’t tell anyone… … here I am 😉 https://t.co/x1F2BJnH3yFourth seed David Goffin headlines the other section of the top half, and is projected to face Nick Kyrgios in the second round. The Aussie has spent several months on the sidelines and will be raring to take the court in front of his home crowd.Sixth seed Ilya Ivashka, who had a breakout year in 2021, is a potential dark horse in this section. The Belarusian will face Richard Gasquet in his opener, followed by a potential clash with home favorite Jordan Thompson.Semifinal prediction: Alexei Popyrin vs Ilya IvashkaBottom half: Grigor Dimitrov, Andy Murray, Reilly Opelka headline stacked sectionAndy Murray (L) and Grigor DimitrovSeeded players: (2) Reilly Opelka, (3) Grigor Dimitrov, (5) Benoit Paire, and (8) Mackenzie McDonaldExpected semifinal: Reilly Opelka vs Grigor DimitrovDark horse: Andy MurrayAnalysis: Second seed Reilly Opelka headlines the bottom half of the draw in Melbourne. The American had the best season of his career in 2021, reaching a career-high ranking of World No. 19.The 24-year-old will face a qualifier in the second round ahead of a potential quarerfinal clash against mercurial fifth seed Benoit Paire.On the other side of the half is third seed Grigor Dimitrov. The 30-year-old reached the semifinals in San Diego and Indian Wells towards the end of last year and will be looking to carry his momentum into 2022.Krasimir 🇧🇬 🌎🌍🌏@lobdownthelineGrigor practicing with Rafa | #AusOpen#Dimitrov #Nadal 🎥: Dante Bottini1:01 AM · Jan 2, 2022262Grigor practicing with Rafa | #AusOpen#Dimitrov #Nadal 🎥: Dante Bottini https://t.co/cr043fQkRzThe Bulgarian has a tricky draw though -- he is projected to take on former World No. 1 Andy Murray in the second round. Murray had a strong end to 2021, and was one of the standout players at the Mubudala World Tennis Championship last month.Eighth seed Mackenzie McDonald and Adrian Mannarino are also potenital challengers for the title in the bottom half.Semifinal prediction: Reilly Opelka vs Grigor DimitrovPrediction for the final: Grigor Dimitrov def. Ilya IvashkaAlso Check Out: Complete ATP Cup 2022 Schedule