Fourth seed Alexander Zverev continued his serene progress through the Wimbledon draw by beating Tennys Sandgren 7-5, 6-2, 6-3 on Thursday to reach the third round. Zverev will now play the winner of the all-American second-round match between Taylor Fritz and Steve Johnson for a place in the second week of the tournament.Third round bound 💪@AlexZverev defeats Tennys Sandgren 7-5, 6-2, 6-3 as his good form continues #Wimbledon pic.twitter.com/V4FaaYnEvZ— Wimbledon (@Wimbledon) July 1, 2021Sandgren put up stern resistance before he got broken in the 11th game of the opener, which his opponent duly served out. From there, Zverev was all over the American.Zverev won five games on the trot from 0-1 down in the second to effectively end the match as a contest. Sandgren had one look at the Zverev serve in the third set, but the opportunity went begging as the fourth seed sealed victory in under two hours.On that note, let's have a look at three talking points from the German's comfortable win:#1 Alexander Zverev put on a serving clinic once againContinuing from his strong serving performance against Tallon Griekspoor, Alexander Zverev sent down 13 aces and conceded only two double faults against Tennys Sandgren.Zverev got an impressive 72% of his first serves in, and won all but eight out of 50 of those points. The German was also strong on his second serve, winning 15 of 19 points for an impressive winning rate of 79.Zverev with 72% first serves in. If he can stay around that, he has a shot at the title in my opinion. #Wimbledon— AR (@Athique57) July 1, 2021#2 Alexander Zverev's return was almost as effective as his serveAlexander ZverevAlexander Zverev was stronger than his opponent in every department on Thursday. Not only did he serve imperiously, but the German was also impressive in his return games. Zverev consistently eked out break-point opportunities (10) on Sandgren's serve. He ended up converting five of them, which was pivotal in the eventual outcome.The fourth seed broke once in the first set and twice apiece in the next two sets. With Zverev not losing his serve all match, Sandgren was up against it from the start.#3 Alexander Zverev showcased his ability to win points at the netAlexander ZverevApart from his impressive serving and returning, Alexander Zverev also showed a penchant for winning points at the net against Tennys Sandgren.Usually a baseliner, the tall German came to the net 34 times against the American and won 27 of those points. With an already strong serve and solid groundstrokes, Zverev has added another dimension to his grasscourt game as he looks to make a deep run at Wimbledon this year.Zverev has never been past the fourth round here in five previous visits, but that could likely change based on the manner of his two wins at SW19 this week.