Sports Cryptic crossword - help needed

[crosswordfan]

Jacked off by KIEREN....????E
Firstly pensioner gets defensive...????O
Nicky's greatest challenge...M??E?S
Rosewall's double plated....????R
Robbie's one to urge his teamates...S???
We get a good view of the gee-gees initially(1,1,1)...?T?
Unlucky to hit it, lucky to stay on it (8)...?R????A?
On the flat at last (6)....?????R
The cowboy sat on the horse for nothing (5)...????O

[shaneystar2]

The cowboy sat on the horse for nothing ...Rodeo

[kayakamina]

5 Spur

[Muffet]

Unlucky one = crossbar

[shaneystar2]

Unlucky to hit it, lucky to stay on it ...Crossbar ?

[Muffet]

Have these given you any additional letters, and are you sure of the ones that you've given?

[crosswordfan]

Thanks everyone - I only have one left now:

We get a good view of the gee-gees initially(1,1,1)...?T?

[Muffet]

By rights, it should be the initial letters O T G.
There are a few abbreviations OTG here, but nothing that seems to fit.
http://www.acronymfinder.com/af-query.asp?acro nym=o

Just for interest, what were the other answers that you were missing. They looked a bit impossible.

[Muffet]

Sorry. A bit missing. Should have been
http://www.acronymfinder.com/af-query.asp?acro nym=otg

[crosswordfan]

Thanks Muffet but we are going for ATR (At the Races).

Other answers:
Jamie (as in Jamie Spencer)
Paulo (as in Farreira - Chelsea)
Melees (fights in Gaelic football)
Ansar (Dual winner of Galway Plate)
Bumper (last race of the day)

[Muffet]

Thanks for that. Best of luck. It seems to have been a right stinker.