Match detailsFixture: (1) Novak Djokovic vs Andrej MartinDate: 28 May 2021Tournament: Belgrade Open 2021Round: SemifinalsVenue: Belgrade, SerbiaCategory: ATP 250Surface: Red ClayPrize money: €511,000Match timing: Not before 2 pm local time, 12 pm GMT, 8 am ESTLive telecast: USA - Tennis ChannelNovak Djokovic vs Andrej Martin previewNovak Djokovic, the top seed in Belgrade, was in phenomenal form in the quarterfinals against Federico Coria. The Serb crushed the 29-year-old Argentine 6-1, 6-0 with a clinical display and will face qualifier Andrej Martin in the semifinals on Friday.The victory was the 952nd of Djokovic's career and lifted him to joint-fifth on the list of most wins in the Open Era.The Serb's season has been a mixed bag so far. He managed to win the Australian Open but then spent several weeks on the sidelines recovering from an abdominal injury. After his return to the tour, he suffered surprising losses to the likes of Dan Evans and Aslan Karatsev before making the Rome final, where he was defeated by Rafael Nadal.9️⃣5️⃣2️⃣ wins and counting 😲@DjokerNole jumps to fifth on the Open Era wins list 👏 pic.twitter.com/uOslylHXIC— ATP Tour (@atptour) May 27, 2021His semifinal opponent in Belgrade, qualifier Andrej Martin, knocked out third seed Nikoloz Basilashvili in the round of 16 and fifth seed Dusan Lajovic in the last eight. The World No. 119 had won just three of his last seven matches heading into the tournament, but has now won five in a row in the Serbian capital.Martin fought back from a set down against Lajovic to win 3-6, 6-3, 6-4 after an intense battle. The 31-year-old, whose only ATP final came on clay in Croatia in 2016, has proven over the course of the week that he can be a dangerous player on this surface.Novak Djokovic vs Andrej Martin head-to-headNovak Djokovic and Andrej Martin have not faced off on tour before, so their head-to-head is tied at 0-0.Novak Djokovic vs Andrej Martin predictionCan Andrej Martin script another fairytale on Friday?Novak Djokovic, who landed in the same half of the Roland Garros draw as Rafael Nadal and Roger Federer, will want to have a strong run in Belgrade before the French Open kicks off on Sunday.The top half of the @rolandgarros draw is STACKED 😲✅ Djokovic & Nadal are in the same half✅ Djokovic & Federer are in the same quarter pic.twitter.com/tcgwX0uVO5— ATP Tour (@atptour) May 27, 2021Djokovic has looked solid for most of the season, but there are a few chinks in his game he will want to iron out before heading to Paris. Martin, meanwhile, is gearing up for the biggest match of his career. The Slovakian has nothing to lose and will throw the kitchen sink at Djokovic to try and pull off the upset.Djokovic, however, has looked in top form and should have enough in the tank to win this match.6-1, 6-0 😳@DjokerNole moves into the semi-finals at the #BelgradeOpen with a convincing win over Coria. pic.twitter.com/tFWApNquKn— ATP Tour (@atptour) May 27, 2021Prediction: Novak Djokovic to win in straight sets