loss to Sporting Kansas City. On 15 September Manotas scored twice against Portland in a 4–1 Dynamo win. On 29 September against the San Jose Earthquakes Manotas scored and got the winning assist as the Dynamo came back from 2–0 down to win 3–2. The goal was his 15th MLS goal of the year, setting a new Dynamo record. On the final day of the season, Manotas scored a brace to lead the Dynamo to a 3–2 win over the LA Galaxy. Manotas scored 8 goals in the final 8 games of the season, but his strong finish was not enough to help Houston make the playoffs. He finished 4th in the MLS Golden Boot race with 19 goals. Despite a poor season as a team in league play, Manotas and the Dynamo enjoyed great form in the US Open Cup. He scored once to give Houston a 1–0 win over Minnesota United in the Round of 16, scored twice to help Houston defeat Sporting Kansas City in the quarterfinals, and scored once against LAFC in the semifinals. He scored a brace on 26 September as the Dynamo defeated the Philadelphia Union 3–0 in the final. The first came in the 5th minute as Manotas headed in an Alberth Elis cross from his knees. The second came in the 25th minute when Manotas took a pass from Elis, dribbled past one defender before firing a left-footed shot from the top of the box that bounced off the post and in. His 6 goals in the Open Cup made him the tournament's top scorer and saw him named Player of the Tournament. Manotas ended the season with 19 goals in MLS play and 25 in all competitions, both Dynamo single season records. 2019 season Manotas made his CONCACAF Champions League debut on 19 February 2019 in a 1–0 win against CD Guastatoya. On 22 February 2019, Manotas was rewarded for his strong 2018 season with a new contract from the Dynamo. On 26 February, in his first game since signing his new contract, Manotas came on as a substitute and scored a brace to send Houston past Guastatoya and on to the next round of the Champions League with an aggregate score of 3–1. His performance saw him named to the CONCACAF Champions League Team of the Week. On 2 March, the Dynamo opened MLS play against Real Salt Lake. In