In a mixing bowl, combine olive oil, rosemary, thyme, garlic, salt, and pepper.
Rub the herb mixture all over the sirloin tip roast.
Place the roast in a roasting pan.
Roast in the preheated oven for 15 minutes.
Reduce the oven temperature to 325°F (165°C) and continue roasting for 1 hour and 15 minutes, or until the internal temperature reaches 135°F (57°C) for medium-rare.
Remove the roast from the oven and let it rest for 15 minutes before slicing.