Trinidad and Tobago's 50 metres freestyle swimmer George Bovell III and Judo athlete Christopher George are in action for T&T on Thursday.
Laser sailor Andrew Lewis has placed 34th in the sixth race in Rio.
This has helped him move up just one spot in the overall standings from 43rd at the end of Race 5, to 42nd.
Lewis had placed 42nd in Race 1, 34th in Race 2, 39th in Race 3, 36th in Race 4 and 41st in Race 5.
There are 10 races in the preliminary events.
There is no competition in this event on Thursday.
Lewis will next participate on Friday in Races 7 and 8 tand Races 9 and 10 on Saturday.
The medal race is on Monday.
Laser sailor Andrew Lewis has placed 41st in the fifth race in Rio.
This now places him at position 43 in the overall standings.
Prior to today's race, Lewis placed 42nd in Race 1, 34th in Race 2, 39th in Race 3 and 36th in Race 4.
There are 10 races in the preliminary events and Lewis will have to make up significant ground in the next five races to qualify for the medal race.
Race six takes place on Wednesday afternoon, followed by a rest day on Thursday.
Races 7 and 8 take place on Friday and races 9 and 10 are on Saturday.
An early start to the events involving Trinidad and Tobago athletes on Tuesday.
Rower Felice Chow will take to the water for the third time since Saturday as she competes in the quarter-finals of the Women's Single Sculls competition.
Tuesday also sees swimmer Dylan Carter entering competition in swimming and sailor Andrew Lewis will be seeking to better his overall score in the laser category following two races on Monday.
Rio 2016 Schedule: Tuesday 9th August
It's just been three days since the opening of the Olympic Games but already personnel from the Guinness World Book of Records have been busy.
Here are some of the world records that have been broken over the weekend, including some you probably didn't know about.
1. Heaviest weightlifting 56 kg total (male) – Long Qingquan of China
Andrew Lewis improved 8th places in his second race at the Rio Olympics today, placing 34th in the Men's laser (dinghy) sailing Rio 2016.
The race was won by Robert Scheidt of Brazil.
Lewis was at one point in 9th place after the second marker but faded as the race progressed.
Lewis now has a combined 76 points which places him in position number 40 out of 46 competitors.
Julio Alsogaray of Argentina placed 2nd and Sam Meech of New Zealand was third.
Laser sailor Andrew Lewis has finished 42nd in Race 1 of the Men's Laser (Dinghy) event in Rio.
The race was won by Croatia's Tonci Stipanovic.
Lewis trailed the winner by three minutes and 38 seconds in the race that ended around 1.20 this afternoon following a delayed start.
Sergey Komissarov of Russia was second and Rutger van Schaardenburg was third.
A total of 45 participants entered the race.
We'll bring you updates as we get more.