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Sun should be easy pray for Darcis. He is 2-22 against Top 300 players (none of them are Top 50). He beat Li and Ilhan who was in horrible form back then. When it comes to form, Sun lost 4 straight matches in straight sets. He lost to Donskoy by 5. The Russian has more inconsistency in relevant matches than Darcis. After that Sun lost at 17, 16 and 18 games to Kelly, Bachinger and Tsitsipas. Darcis is better in every way.

He is 15-0 against players outside the Top 100. There were some problems with a back injury which affected his results. We can say that things fell into place at Davis Cup. On Thursday, he almost beat A. Zverev. Granted, the first round match with Zhang was a struggle but that was a start of a new tour against a player who used to be Top150. For comparison's sake, Zhang beat Sun by 7 two years ago. On hard court, Darcis is 9-0 against players outside the Top100 this season. He lost just one set (to Groth). He won 5 matches under 18,5. That's not much but Shapovalov and Marterer aren't comparable and he beat them in straight sets (by 7 and 4).

Sun played just 8 matches with Top 150 in his 2-22 record. Darcis is better than most of them. Sun lost those 8 matches easily (number of games in the brackets): Tsitsipas(18), Donskoy(21), Tipsarević(16), Bourgue(14), Kudla(17), Soeda(18), Sela(14), Soeda(12). I have to say that he played Bourges and Tipsarevic on clay court and that some matches are from a time he was weaker than today. Regardless of that, I think this is a good choice. Darcis dealth with back problems and Suna should beat him within this margin, as the last three of Sun's opponents did.