Page 274 of 309
Re: Tennis Random, Random (On Court)
Posted: Sat Nov 04, 2023 5:03 pm
by ponchi101
ashkor87 wrote: ↑Thu Nov 02, 2023 8:15 am
not sure if this is reliable but it is relatively recent..
https://tennisnerd.net/how-court-surfac ... is-betting
court speeds are rated as follows (roughly corresponds to what I have been observing so I tend to believe it)
AO: 42
Turin 42.1
Shanghai 42.9
Paris 37.5
Canada (which one?) 36.3
USO 35.4
Cinci 33.6
Miami 30.3
IW 27.4
FO 21
Montecarlo 24.9
Madrid 20.9
Rome 22
Fastbackss wrote: ↑Fri Nov 03, 2023 3:15 pm
ponchi101 wrote: ↑Fri Nov 03, 2023 1:04 pm
I can't open the page.
How does the scale read? What does the number implies? A coefficient of something?
I don't see where it is explained but they do give the following:
Slow Court: <29
Medium Slow Court: 30-34
Medium Court: 35-39
Medium Fast Court: 40-44
Fast Court: >44
That sounds reasonable and at the same time very unlikely.
Let's assume that indeed it is a coefficient of restitution. That would mean that, after the ball bounces, it would keep only the original speed TIMES the coefficient.
So. For the AO, a ball hit at 100 KPH would travel at 42 KPH AFTER THE BOUNCE. But that would mean that the courts at the AUSSIE would be twice as fast as at RG and, although I can perfectly well see that the Aussie is faster than RG, it is not that much faster.
I have a hard time accepting that. Agree it has to be some coefficient, but maybe it is a more complex formula.
Re: Tennis Random, Random (On Court)
Posted: Sat Nov 04, 2023 8:50 pm
by ashkor87
It is a linear combination , as I said, of coefficient of restitution and (1 minus coefficient of friction,,,) with weights to each component
Re: Tennis Random, Random (On Court)
Posted: Sat Nov 04, 2023 10:30 pm
by Fastbackss
Taylor Townsend gave a walkover yesterday in the quarters at Midland. Hopefully she is okay
Re: Tennis Random, Random (On Court)
Posted: Fri Nov 10, 2023 6:03 pm
by Fastbackss
John Millman retiring at end of Australian swing
Tennis Random, Random (On Court)
Posted: Fri Nov 10, 2023 7:09 pm
by meganfernandez
Fastbackss wrote:John Millman retiring at end of Australian swing
He is outspoken on Twitter. Hope he stays involved. Will be remembered for beating a Federer at the U.S. Open that year when the bottom of Ashe stadium had the conditions of an infrared sauna.
Sent from my iPhone using Tapatalk
Re: Tennis Random, Random (On Court)
Posted: Fri Nov 10, 2023 10:23 pm
by ti-amie
Re: Tennis Random, Random (On Court)
Posted: Sat Nov 11, 2023 12:32 am
by ashkor87
Fastbackss wrote: ↑Sat Nov 04, 2023 10:30 pm
Taylor Townsend gave a walkover yesterday in the quarters at Midland. Hopefully she is okay
She is playing in BJK cup...maybe that is what it was about
Re: Tennis Random, Random (On Court)
Posted: Sat Nov 11, 2023 1:54 am
by Owendonovan
ponchi101 wrote: ↑Sat Nov 04, 2023 5:03 pm
ashkor87 wrote: ↑Thu Nov 02, 2023 8:15 am
not sure if this is reliable but it is relatively recent..
https://tennisnerd.net/how-court-surfac ... is-betting
court speeds are rated as follows (roughly corresponds to what I have been observing so I tend to believe it)
AO: 42
Turin 42.1
Shanghai 42.9
Paris 37.5
Canada (which one?) 36.3
USO 35.4
Cinci 33.6
Miami 30.3
IW 27.4
FO 21
Montecarlo 24.9
Madrid 20.9
Rome 22
Fastbackss wrote: ↑Fri Nov 03, 2023 3:15 pm
ponchi101 wrote: ↑Fri Nov 03, 2023 1:04 pm
I can't open the page.
How does the scale read? What does the number implies? A coefficient of something?
I don't see where it is explained but they do give the following:
Slow Court: <29
Medium Slow Court: 30-34
Medium Court: 35-39
Medium Fast Court: 40-44
Fast Court: >44
That sounds reasonable and at the same time very unlikely.
Let's assume that indeed it is a coefficient of restitution. That would mean that, after the ball bounces, it would keep only the original speed TIMES the coefficient.
So. For the AO, a ball hit at 100 KPH would travel at 42 KPH AFTER THE BOUNCE. But that would mean that the courts at the AUSSIE would be twice as fast as at RG and, although I can perfectly well see that the Aussie is faster than RG, it is not that much faster.
I have a hard time accepting that. Agree it has to be some coefficient, but maybe it is a more complex formula.
I play tennis at work with a collegue on a polished hardwood basketball court just for fun, ball speed doesn't change much after the bounce. We have padded walls in that gym.
Re: Tennis Random, Random (On Court)
Posted: Sat Nov 11, 2023 4:25 am
by ashkor87
Wood courts are notoriously fast ...
Re: Tennis Random, Random (On Court)
Posted: Sat Nov 11, 2023 1:33 pm
by meganfernandez
Owendonovan wrote:ponchi101 wrote: ↑Sat Nov 04, 2023 5:03 pm
ashkor87 wrote: ↑Thu Nov 02, 2023 8:15 am
not sure if this is reliable but it is relatively recent..
https://tennisnerd.net/how-court-surfac ... is-betting
court speeds are rated as follows (roughly corresponds to what I have been observing so I tend to believe it)
AO: 42
Turin 42.1
Shanghai 42.9
Paris 37.5
Canada (which one?) 36.3
USO 35.4
Cinci 33.6
Miami 30.3
IW 27.4
FO 21
Montecarlo 24.9
Madrid 20.9
Rome 22
Fastbackss wrote: ↑Fri Nov 03, 2023 3:15 pm
I don't see where it is explained but they do give the following:
Slow Court: <29
Medium Slow Court: 30-34
Medium Court: 35-39
Medium Fast Court: 40-44
Fast Court: >44
That sounds reasonable and at the same time very unlikely.
Let's assume that indeed it is a coefficient of restitution. That would mean that, after the ball bounces, it would keep only the original speed TIMES the coefficient.
So. For the AO, a ball hit at 100 KPH would travel at 42 KPH AFTER THE BOUNCE. But that would mean that the courts at the AUSSIE would be twice as fast as at RG and, although I can perfectly well see that the Aussie is faster than RG, it is not that much faster.
I have a hard time accepting that. Agree it has to be some coefficient, but maybe it is a more complex formula.
I play tennis at work with a collegue on a polished hardwood basketball court just for fun, ball speed doesn't change much after the bounce. We have padded walls in that gym.
Yikes! We had a basketball court at my old office and I thought about hitting on it.
Sent from my iPhone using Tapatalk
Re: Tennis Random, Random (On Court)
Posted: Sun Nov 12, 2023 8:20 pm
by ti-amie
Re: Tennis Random, Random (On Court)
Posted: Mon Nov 13, 2023 12:04 am
by ashkor87
Sad...maybe good for them though...hadn't been looking very positive on the court lately ..noticeable at the USO even ..
Re: Tennis Random, Random (On Court)
Posted: Mon Nov 13, 2023 1:00 am
by ashkor87
Wonder how much stress on the relationship because K doing much better than S in singles...may have motivated Siniakova to take singles more seriously, which she did seem to, this year. The fact that most courts are slower now, will favor doubles specialists, who tend to be a bit slower on their feet - which is often why they do better in doubles in the first place (Sania, Bhupathi, Rajeev Ram...)
Re: Tennis Random, Random (On Court)
Posted: Mon Nov 13, 2023 3:47 am
by dryrunguy
(Dumb question... Where are we talking about the ATP finals? For the life of me, I can't find the thread. I saw the WTA YEC thread, but I can't find the ATP parallel thread.)
Re: Tennis Random, Random (On Court)
Posted: Mon Nov 13, 2023 6:18 am
by ti-amie
Sorry Dry! I put it under team and country cups (and was rightly chastised for it!)