As a vice admiral, Tsuru knows haki. That alone should be enough to beat Chaka
"There are some qualities, some incorporate things,/ That have a double life, which thus is made/ A type os twin entity which springs/ From matter and light, evinced in solid and shade" - Edgar Allan Poe, "Silence"
Tsuru is a Vice Admiral. She just can't be weak. In One Piece you won't become Vice Admiral or Admiral if you are weak. It's obvious and Chaka... well he was strong for average East Blue pirate, but for these ones he is damn weak. Even Fukaboshi won't have any problems winning against him on land.
All the DF abilities on woman are feminine, a flower to Robin, a bubble bath to Califa, laundry to Tsuru, a perfect skin to Alvida, a love-cage with S&M to Hina, petrific-love power to Hancock, taking care of children and oldmen to Bonney and guessing anxiety for eat to Big Mom.
Chaka's out, Tsuru is my favorite woman character in One Piece, she can't lose, everyone respect her in the marines.
This should be quite easy group, but still...
I believe these people should advance to the next round:
1. Dracule Mihawk. He is the world's strongest swordsman and according to what he has already shown... he should not only be the winner of this group, but he should be among the strongest people out there.
2. Vice Admiral Tsuru. She is a Vice Admiral, so it's obvious that she knows Haki to some extent. She is as well from Garp's and Sengoku's generation and she was Vice Admiral during Roger's times, so she is damn experienced not only in tactics, but fights as well and she has DF as well that enabled her to effortlessly take out quite a considerable ammount of pirates who came to the War in Marineford.
So the unfortunate guy here seems to be Fukaboshi.
I don't really think Tsuru has much to offer in the next round to make things interesting. Yes, she's an OG marine with a stupid devil fruit ability that has some uses but I really don't think she would actually win against Fukaboshi.
The thing is that fight doesn't seem to be held in water. It seems to be held on land, thus I doubt Fukaboshi has any considerable chances against Tsuru, especially as we've seen during Marineford War she even without beeing serious managed to easily take down considerable ammounts of New World pirates with her DF. So I don't see how Fukaboshi can handle her. Especially since she also knows Haki and has tons of experience over him. And also if he isn't in the water his mobility is way lower than normally, so I believe he would be even slower than a normal human...