"Roddick has good presence on the court and has so much adrenalin"

This quote by Richard Krajicek is referring to the tennis player Andy Roddick. It is a compliment to Roddick's capability on the court. Krajicek is saying that Roddick has an excellent existence on the court, implying that he is able to stay focused and composed in the face of pressure. He also has a lot of energy and interest, which is most likely due to the high levels of adrenalin he experiences when playing. This is an excellent possession for any professional athlete, as it assists them to stay determined and carry out at their best. Roddick's capability to remain calm and made up, while also having a great deal of energy and interest, is likely what has actually made him so effective in his profession.