Top five stories so far on day four of the Paris Olympics

There has been more triathlon disruption on day four of the Paris 2024 Olympics as the water quality in the River Seine was again deemed too poor to swim in.

That means that the men's triathlon race has been put back from Tuesday morning to Wednesday and remains in doubt.

After last week's upheaval concerning Charlotte Dujardin, Great Britain's equestrian team got their bid for dressage glory under way.

Matt Richards was one of six GB medallists on Monday and he survived a scare in the swimming, while rowing pair Mathilda Hodgkins Byrne and Rebecca Wilde also progressed.

Meanwhile, men's basketball star Giannis Antetokounmpo is still waiting for his first Olympic win with Greece.

The men's triathlon was due to start at 07:00 BST, with the swimming leg taking place in the River Seine.

But after swimming training for triathletes was cancelled on Sunday and Monday, tests revealed the water quality still did not reach the required standard.

Heavy rainfall in Paris on Friday and Saturday has caused the water quality to diminish and the men’s race has been put back to Wednesday at 09:45 BST.

The women's event is due to start at 07:00, but organisers say both races only have a 60% chance of going ahead on Wednesday.

Friday remains a back-up date for both races but, as a last resort, organisers say the event could be contested as a duathlon - just the cycling and running legs.

The surfing is being held in Tahiti, French Polynesia, and today's sessions have also been postponed, due to adverse weather conditions.

The events were scheduled to begin at 18:00 BST. Technical delegates are set to decide on the next sessions at 18:45.

Team GB medalled in five of the six equestrian events at Tokyo 2020 but their preparations for Paris were rocked last week after a video emerged of Charlotte Dujardin "excessively" whipping a horse.

Britain's joint-most decorated female Olympian then pulled out of the 2024 Games and was replaced by Becky Moody.

Moody completes GB's dressage trio with Charlotte Fry and Carl Hester, who were Dujardin's team-mates as they won team bronze in Tokyo.

The dressage competition began on Tuesday morning, with world number 10 Hester ranked third after the first 10 qualifying runs.

Moody is in action later at 16:11 BST while Fry - the world number three - will be first to go as qualification continues on Wednesday (10:00 BST).

Matt Richards narrowly missed out on swimming gold in the men's 200m freestyle on Monday evening.

The 21-year-old was back in action this morning in the 100m freestyle heats and only just made it through to the semi-finals.

Richards came fifth in his heat and his time of 48.40 seconds was fractionally inside the slowest qualifying time of 48.41.

Team-mate Jacob Whittle also came fifth in his heat but just missed out on the top 16 qualifiers.

Richards was rested for the 4x200m freestyle heats and a GB team consisting of James Guy, Jack McMillan, Kieran Bird and Tom Dean were the fastest in qualifying.

The final takes place later at 21:15 BST and GB can bring in Richards and/or Duncan Scott, who was fourth in the individual final.

Anna Hopkin came fourth in her women’s 100m freestyle heat and will race in the semi-finals at 20:33.

In the rowing, British pair Mathilda Hodgkins Byrne and Rebecca Wilde finished just behind defending champions Romania in their semi-final to qualify for the women's double sculls final on Thursday.

Team GB's Nathan Hales has qualified for the men's trap final in the shooting. That will take place from 14:30 BST.

British judoka Lucy Renshall edged past Australia's Katharina Haecker in the first round of the women's 63 kg category, only to be knocked out in the next round by former GB team-mate Lubjana Piovesana, who switched to Austria in January 2023, via a golden score.

Giannis Antetokounmpo was the flagbearer for Greece after helping their men's basketball team qualify for Paris.

After Greece lost to Canada on Antetokounmpo's Olympic debut, they faced European champions Spain in their next group game.

The NBA's two-time Most Valuable Player again led the scoring with 27 points but Spain triumphed 84–77 to leave Greece needing to beat Australia to have any chance of reaching the quarter-finals.

Canada are led by Shai Gilgeous-Alexander, this season's NBA MVP runner-up, and they are currently in action against Australia in today's other Group A game.