---
title: "Is The Aidan O’Brien Form A Worry Heading Into Guineas Weekend?"
canonical: "https://readhorseracing.com/2026/04/28/is-the-aidan-obrien-form-a-worry-heading-into-guineas-weekend/"
type: "post"
language: "en-GB"
author: "Kyle Curran"
section: "Features"
published: "2026-04-28T15:07:57Z"
modified: "2026-05-01T09:47:57Z"
---

# Is The Aidan O’Brien Form A Worry Heading Into Guineas Weekend?

**The Aidan O’Brien form when sending horses over to the UK so far this season has to be a worry ahead of Guineas weekend at Newmarket after he has a SIXTH loss in a row.**

### Aidan O’Brien Form Continues To Be Poor In UK

We’re just days away from the [2000 Guineas](https://readhorseracing.com/2026/04/27/2000-guineas-betting-odds-2026/) at Newmarket and Aidan O’Brien continues to show poor form in the UK.

New Zealand ran in the Derby Trial at Epsom on Tuesday and was well beaten, finishing fourth. John & Thady Gosden’s hot form continued as Saxon Street bolted up.

#### WATCH: New Zealand Well Beat In Derby Trial

> The unbeaten Saxon Street (Saxon Warrior) lands Listed honours on his return, running out a good winner of the [@Betfred](https://twitter.com/Betfred?ref_src=twsrc%5Etfw) Blue Riband Trial Stakes for [@WilliamBuickX](https://twitter.com/WilliamBuickX?ref_src=twsrc%5Etfw) and John and Thady Gosden [@EpsomRacecourse](https://twitter.com/EpsomRacecourse?ref_src=twsrc%5Etfw) [pic.twitter.com/B51kavguf7](https://t.co/B51kavguf7)
>
> — Racing TV (@RacingTV) [April 28, 2026](https://twitter.com/RacingTV/status/2049122876486226294?ref_src=twsrc%5Etfw)

O’Brien has sent over six horses to the UK since the flat season got underway and all six have lost.

The yard have hot favourite in the [1000 Guineas betting odds](https://readhorseracing.com/2026/04/27/1000-guineas-betting-odds-2026/), Precise but the current Aidan O’Brien form has to be a slight worry.

* * *

### Aidan O’Brien Form In UK So Far This Season

- 28th April – Epsom: New Zealand 4/5f (4th)
- 24th April – Sandown: Action 4/6f (4th)
- 18th April – Newbury: Albert Einstein 9/4f (3rd)
- 16th April – Newmarket: Amadeus Mozart 11/4 (2nd)
- 15th April – Newmarket: Beautify 9/2 (8th)
- 15th April – Newmarket: Isaac Newton 3/1 (4th)

* * *

### Aidan O’Brien Guineas Horses In Trouble?

The Ballydoyle maestro has well fancied runners in both of the Classics this weekend.

He’ll be [searching for an 11th 2000 Guineas](https://readhorseracing.com/2026/04/28/how-many-times-has-aidan-obrien-won-the-2000-guineas/) win on Saturday and **Puerto Rico** or **Gstaad** could be the one to give him that.

[Gstaad was supplemented](https://readhorseracing.com/2026/04/27/aidan-obrien-supplements-gstaad-for-2000-guineas-ahead-of-newmarket-classic/) for the race, but may still not run. As for Puerto Rico, he might not run either – it all depends on if Coolmore want to split the two up or not.

As for the [1000 Guineas, O’Brien looks for an eighth win](https://readhorseracing.com/2026/04/28/aidan-obrien-1000-guineas-winners-how-many-has-there-been/) – and has two strong chances in **Precise** and **Diamond Necklace** – but like the 2000 Guineas, they may not BOTH run.

See all of O’Brien’s upcoming UK entries below.

* * *

### Form A Worry? Aidan O’Brien UK-Entered Horses This Weekend

O’Brien has entries for both Ascot and Newmarket this weekend in the UK.

#### Friday 1st May

- Brussels – Ascot: Commonwealth Cup Trial (Group 3)

#### Saturday 2nd May

- Gstaad – Newmarket: 2000 Guineas (Group 1)
- Flushing Meadows – Newmarket: 2000 Guineas (Group 1)
- Puerto Rico – Newmarket: 2000 Guineas (Group 1)
- Causeway – Newmarket: 2000 Guineas (Group 1)

#### Sunday 3rd May

- True Love – Newmarket: 1000 Guineas (Group 1)
- Diamond Necklace – Newmarket: 1000 Guineas (Group 1)
- Precise – Newmarket: 1000 Guineas (Group 1)
- Venosa – Newmarket: 1000 Guineas (Group 1)

Note: Both the 2000 and 1000 Guineas will be available to watch on the [ITV Racing schedule](https://readhorseracing.com/2026/04/27/itv-racing-schedule-today-weekly-saturday/) this weekend.