@Happi Not doubting you at all, but when did Novak Djokovic play with X-One? Was it in a full bed or Hybrid? Do you know what tensions he used? How was he performing at that time?
Thanks.
Djokovic used X-One Biphase when he was with Wilson, only when he played with the Nblade paintjob.
And, of course, when he played with Head before go with Wilson.
You can search images on internet.
In those years, I remember that the Bryan Brother played with a fullbed of Tecnifibre NRG2 in his Wilson racquets
Anyway, all the players that used to use fullbed of multi, or full bed of natural gut, now use hybrid stringjobs (natural gut in mains / Poly in crosses.
Djokovic, Bryan brothers, Williams sisters, Federer, Haas, Hewitt, etc.
I don't like multifilament or synthetic gut to play tennis, but, my favorite multi string is Tecnifibre NRG2, and in a second close position Tecnifibre TGV.
Tecnifibre has the best multifilaments string in my opinion. For me, so much better than other beloved multi strings, like Wilson Sensation, Wilson NXT or Babolat Xcel (I hate that string).
Other multifilament I like is the Head RIP control. I would like to try RIP Tour, but I prefer full poly stringbed.