The 19-year-old, who has raced sparingly this season, produced a comfortable 13.18 to win the first of eight heats on Thursday morning.
Joining her in the semis will be Barbados’ Maya Alexis Rollins and Jamaica’s Habiba Harris who ran 13.71 and 13.74 to finish fourth and second in heats eight and seven, respectively.
The Men’s sprint hurdles saw Jamaicans Richard Hall and Daniel Beckford both advance to the semi-finals.
Hall was the tenth-fastest qualifier overall after running 13.58 to win the third heat while Beckford advanced in a non-automatic spot after running 13.74 for fourth in heat one.
Elsewhere, 100m silver medallist Adaejah Hodge was the fastest through to the 200m semi-finals after winning her heat in 23.19.
Jamaica’s Shanoya Douglas and Sabrina Dockery also advanced to the semis scheduled for later on Thursday.
Douglas ran 23.51 to comfortably win her heat while Dockery ran 23.80 for second in hers.
In the Men’s equivalent, Guyana’s Jackson Clarke won heat two in 21.37 to advance while Bahamian Carlos Brown Jr finished second in heat six in 21.31 to get through.
Barbados’ Aragon Straker (21.23) and Jamaica’s Romario Hines (21.35) both advanced as non-automatic qualifiers.
With only the three women’s 100m medals credited to the Caribbean so far at the five-day championships, there were slight hopes that the tally might have been increased on Thursday’s third day of action, but it was not to be.
Martinez (15.00m) and Penn (14.71m) struggled for rhythm in the hop, skip, and jump event and, as such, placed 10th and 11th, respectively, while Baxter, who got into the final eight, placed sixth with a best leap of 16.58m.
Prior to that, only Jamaica’s Kerrica Hill and Cuba’s Jocelyn Echazabal progressed in the women’s 100m hurdles final, and it will also be a Jamaica-Cuba combination for the men’s 110m hurdles final, as only Richard Hall and Yander Herrera safely navigated the semi-final round.
Echazabal (13.31s) booked her spot in the final with a second-place finish in semi-final one, while Jamaica’s Habiba Harris (13.64s) placed
Hill continued her charge towards the gold medal, as she won semi-final two in a flat 13.00s, while Maya Rollins (13.96s) of Barbados finished down the track.
On the men’s side, Jamaica’s Daniel Beckford (13.80s) missed out, as he placed sixth in his semi-final.
Cuba’s Herrera placed fourth in his semi-final, but his 13.62s was good enough for one of the two non-automatic qualifying spots, while Jamaican Hall (13.44s) placed second in semi-final three, behind American Ja’Kobe Tharp, who clocked a World Under-20 leading mark of 13.11s.
The sprint hurdles finals are scheduled for 5:05pm and 5:25pm Jamaica time on Friday.
Meanwhile, Adaejah Hodge of British Virgin Islands and Jamaica’s Shanoya Douglas will be present in the women’s 200m final, while Carlos Brown of the Bahamas will be the sole Caribbean representative in the men’s event.
Hodge, the 100m silver medallist, topped semi-final two in an easy 23.18s, while Jamaica’s Sabrina Dockery (23.75s) placed fourth and missed out.
Douglas (23.34s) placed second in the third semi-final to secure her spot in the medal event.
Guyana’s Jackson Clarke (21.88s), Jamaica’s Romario Hines (21.68s) and Barbadian Aragorn Straker (21.30s), finished seventh, fourth and fifth in their respective semi-finals and missed out, as Brown Jr (21.19s) placed third and booked one of the fastest non-automatic qualifying spots.
The 200m finals are scheduled for 6:35pm Jamaica time also on Friday.
