The Argentine Olivo brought experience to their Court 6 clash, having taken out Jo-Wilfried Tsonga in the opening round on Court Philippe-Chatrier six years ago.
He had contested only the subsequent Wimbledon main draw at Grand Slam level and had come up short in 14 qualifying attempts since.
“He's a very experienced player, I think 31 years old. He's played probably longer tennis than I've lived, so he knows what to do in the important moments,” Shang said. “He's a very annoying player for me. He's got that forehand to my backhand, very high and it's effective, so I just kept staying patient.
“Always I try to stay optimistic on all the shots. I think I can do better here, I can do better on the next shot but my coach always told me, take the positive, don't think you can always do better all the time, or how bad you're doing right now so that's really helped me.”